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123Instructables822,752Views670CommentsIndonesia
Just an ordinary person who loves #thinking and #tinkering

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500+ Comments Earned a silver medal
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Make it Move
Contest Winner Runner Up in the Make it Move
Puzzle Challenge
Contest Winner Second Prize in the Puzzle Challenge
Pocket-Sized Contest
Contest Winner Second Prize in the Pocket-Sized Contest
PVC Contest 2017
Contest Winner Second Prize in the PVC Contest 2017
Sci-Fi Contest 2016
Contest Winner Runner Up in the Sci-Fi Contest 2016
Survival Ready Contest
Contest Winner Second Prize in the Survival Ready Contest
Puzzles Challenge
Contest Winner Runner Up in the Puzzles Challenge
Automation Contest 2016
Contest Winner Runner Up in the Automation Contest 2016
Wizarding Contest
Contest Winner First Prize in the Wizarding Contest
Flat Pack Contest
Contest Winner Runner Up in the Flat Pack Contest
  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    Depend on the size of your rims. There are many "Spoke Calculator" on the net, or simply ask the local sellers and they will give you the correct size.

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  • Multifunction Paper Tray

    Yes, surely you can. Use any paper type and any size depends on the size of Paper Tray you want as outcome.We frequently use it as trash bin for fish bones, apple peel, that kind of trash are sometimes wet, so we use old magazine glossy paper.

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  • Automatic Smart Coffee Maker With Arduino and Bluetooth

    This is great. I still have a bunch of Arduinos in my box, only time that matters :DThis will be on top of my project list for sure. Great GUI and Control Settings.Thanks for sharing it with us.

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  • How to Win Prizes at Instructables

    Thank you. Some rules have changed but don't stop sharing what you make. Share to this worldwide Instructables Communities. Together we learn new things everyday.

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  • chienline commented on chienline's instructable Survival Whistle
  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    I have no time to post here on Instructables, but I'm still an active DIYer and I spare my time to check and reply every single notification sent by Instructables' Robot to my inbox ^_^Happy Making v(^_^ )

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  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    Technically yes. Then you will have 8 unlaced holes -- 4 holes at each side.Your wheels will not fail you on daily riding, just don't use them on extreme riding or bmx jumpy ride.

    Draw a circle on a piece of paper and write down hole number 1 to 18 (this is one side of the hub).While lacing you can skip hole number 4-9-13-18.At the other side you can skip hole number 2-7-11-16.Then you will get balanced-strength of spokes on your wheel for daily riding ^_^

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  • Get Your ESP8266-12 Ready for AT Commands

    You are welcome ^_^Enjoy tinkering the new toy.

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  • Arduino Battery Voltage Indicator

    If I don't read it wrong, you have the same setup as my project above. Powering Arduino with battery and you want to check the battery level to know when to re-charge the battery.The circuit setup is the same as step #3. Battery to Vin, GND and A0 (through voltage divider resistors) and if you use the above setup and the same code (arduino sketch) then the internal LED or the LED you plug on PIN13 will light up when the voltage reach 6.5V which I set as my "time to re-charge" as you can find in the code.Percentage is just a matter of calculation when we set the max and min of our battery. Let's say my max voltage is 7.4 and min 5V (min voltage to power up the arduino), then 7.4V = 100%5V = 0%6.5V = (6.5 - 5) / (7.4 - 5) x 100% = 62.5%Why I pick 6.5V to recharge when it has 62.5%…

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    If I don't read it wrong, you have the same setup as my project above. Powering Arduino with battery and you want to check the battery level to know when to re-charge the battery.The circuit setup is the same as step #3. Battery to Vin, GND and A0 (through voltage divider resistors) and if you use the above setup and the same code (arduino sketch) then the internal LED or the LED you plug on PIN13 will light up when the voltage reach 6.5V which I set as my "time to re-charge" as you can find in the code.Percentage is just a matter of calculation when we set the max and min of our battery. Let's say my max voltage is 7.4 and min 5V (min voltage to power up the arduino), then 7.4V = 100%5V = 0%6.5V = (6.5 - 5) / (7.4 - 5) x 100% = 62.5%Why I pick 6.5V to recharge when it has 62.5% remaining? That numbers are on paper. In real run, maybe the arduino will shut down when the battery reach 6.2V, because we are not running only the arduino, you should consider the power consumed by LCD or any other modules on your project.If my project dies at 6V and my battery fully charged at 7.8V then the calculation become :7.8V = 100%6V = 0%6.5V = (6.5 - 6) / (7.8 - 6) x 100% = 17.86%, yes.. time to re-charge.So change the code according to your battery used in particular project. LCD consumes a lot of battery juice then I would prefer set the limit in the code and tell me when to re-charge by lighting up the internal LED.

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  • chienline commented on chienline's instructable Arduino Auto Knock
    Arduino Auto Knock

    Awesome!You don't really need buying another relay module to make it works. You need to search and learn how a relay module works. You only need to understand two terms : Normally Open (NO) and Normally Closed (NC).Knowledge is powerful. Gain your power by understanding simple things ;)Do not throw away your relay module. Learn and apply it on another cool project.Cheers.

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  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    I would say that truing a wheel depends on one's skill but not so hard to learn. That project of mine was my first time truing experiment indeed and the wheel stay true until today. It is my daily bike. Just the matter of fasten or loosen (turn left or right) at the correct spoke to eliminate the wiggles on the wheel.Once you spot the rim turning left, then you should loosen one or two spokes on the left and/or fasten one or two spokes on the right.You will learn faster if you watch people working in bike shops or just play Youtube for tutorials, there should be many ;)Long story short, the wheels stay true for a long time depends on the track and the riding styles :DDon't worry if you ride in the city and not doing bmx freestyle jumps :D

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  • chienline commented on chienline's instructable Arduino Auto Knock
    Arduino Auto Knock

    First of all, you need to make sure your power cables : power to selenoid, power to relay board, and power to Arduino. Sometimes, unplug all the wires and re-wiring step by step will solve the problem.Diode connecting selenoid wires, make sure it is not placed in opposite direction because direction on diode does matter.Open Serial Monitor to test the ultrasonic sensor, see if Arduino read the distance right. Changing numbers on the screen will tell you if the ultrasonic sensor is working or not.If possible, please take a shot of your wiring so we, the community, can help inspecting ^_^

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  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    Good job @leoliu041892 !About wheel truing I have no expertise, but I love seeing local traditional wheel maker since I was a kid until now and I feel like... not so difficult. We can build the wheel holder with any materials we can find around, wood, pipes, metals, broom sticks, almost anything.Just make sure the floor is leveled and the wheel holder is also leveled. The truing key itself is only about half a dollar. Put the wheel on its holder. Turn the wheel and watch the rim moving left or right. Use the key to adjust (tighten or loosen). Repeat until you are satisfy with it. Not that easy for the first experience, but not difficult either. Just turn the key left or right and you will learn how to do it well in few minutes. You will know which spoke to pick and how much to turn after…

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    Good job @leoliu041892 !About wheel truing I have no expertise, but I love seeing local traditional wheel maker since I was a kid until now and I feel like... not so difficult. We can build the wheel holder with any materials we can find around, wood, pipes, metals, broom sticks, almost anything.Just make sure the floor is leveled and the wheel holder is also leveled. The truing key itself is only about half a dollar. Put the wheel on its holder. Turn the wheel and watch the rim moving left or right. Use the key to adjust (tighten or loosen). Repeat until you are satisfy with it. Not that easy for the first experience, but not difficult either. Just turn the key left or right and you will learn how to do it well in few minutes. You will know which spoke to pick and how much to turn after several trials.I think I have documentation of wheel truing with pvc pipes too, somewhere in my project collections ^_^ https://www.instructables.com/PVC-Bike-Wheel-Stand...Find no specific wheel truing project of mine, but I used this simple pvc wheel stand to hold my wheel for truing process :D

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  • Arduino Battery Voltage Indicator

    Okay, I used to do the battery checking before and after toying. I see that you want to connect the battery voltage indicator permanently to your battery and your RC toy, but remember that the battery voltage indicator circuit will also drain your battery this way.You need these connectors :T-style connector 1 female, 2 males. (Name this connector C1) T-style connector female to JST male. (Name this connector C2)Battery plugs into C1-Male1.C1-Female plugs into RC toy.C2-Female plugs into C1-Male2.C2-Male goes to Battery Voltage Indicator Circuit.Or you don't even need the C2 connector if you want to solder the circuit directly to C1-Male, but remember to seal the connector properly to avoid short-circuit.

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  • Arduino Battery Voltage Indicator

    Actually you can find the answer in comment section. Saving your time let me do it for you. I love refreshing my memories after all ^_^For 12V battery you can use voltage divider with 3 identical value resistors. So your battery voltage will be divided by 3 and as long as it is not over 15V at peak, it is safe for the arduino analog pin to read.Let's say the voltage divider circuit is now :BatteryPossitive -- R1 -- R2 -- R3 -- BatteryNegative/GNDRun a jumper wire from between R2 -- R3 to Arduino A0.Then you need to change the code from "*2" to "*3" where we calculate back to RealVoltage to be shown on LCD.Find in the code:float voltage = sensorValue * (5.00 / 1023.00) * 2;Change it with this:float voltage = sensorValue * (5.00 / 1023.00) * 3;Yes, simply change the numb…

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    Actually you can find the answer in comment section. Saving your time let me do it for you. I love refreshing my memories after all ^_^For 12V battery you can use voltage divider with 3 identical value resistors. So your battery voltage will be divided by 3 and as long as it is not over 15V at peak, it is safe for the arduino analog pin to read.Let's say the voltage divider circuit is now :BatteryPossitive -- R1 -- R2 -- R3 -- BatteryNegative/GNDRun a jumper wire from between R2 -- R3 to Arduino A0.Then you need to change the code from "*2" to "*3" where we calculate back to RealVoltage to be shown on LCD.Find in the code:float voltage = sensorValue * (5.00 / 1023.00) * 2;Change it with this:float voltage = sensorValue * (5.00 / 1023.00) * 3;Yes, simply change the number "2" to "3" in multiplication, because now we use 3 identical resistors instead of 2.

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  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    In my opinion, as long as you do not use it for extreme sports and the tracks you are running daily is not that kind of off-road tracks, that will be okay with 20 spokes.36 - 20 = 16 holes to be left-out. Just distribute them evenly and do at least 2 crosses on each spokes I think that would be okay.

    Going few years back I need to refresh my mind for a while :DWhen you see 4 or 5 crosses, you are counting with the blue spokes which are on the other side of the working-face. The same side is the red spokes. So 3 crosses is supposed to be with the red spokes, that's why on the next photo I use my palm to better viewing the crosses and blocking the other-side spokes.Yes, I should had drawn the diagram with grey-out style or dash line :D

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  • chienline's instructable CannonBall Shooter's weekly stats:
    • CannonBall Shooter
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      13 comments
  • chienline commented on chienline's instructable CannonBall Shooter
    CannonBall Shooter

    Thank you for your suggestion.

    Yes. To execute the idea in my head, I need to move quickly with familiar app within my free hours (which is now rarely found xD)

    I am so sorry My Friend. Apparently the FCStd file type is not allowed to be uploaded on Instructables. You can send my your email address by private message if you really want to play with that file. I certainly will send to anyone asking for the file ;)

    Thank you.Too shy to share my 'messy/unorganized' FCStd file (>.<) but since you asked for, I will certainly update Step 1 : Files.You will find it there whithin 24 hours since this reply or else try to clear cache before reloading this page ;)

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  • chienline commented on chienline's instructable CannonBall Shooter
    CannonBall Shooter

    Still using FreeCAD with "Part Module". I haven't had enough time to focus on learning Fusion360 yet. I'm still working with simple 3D in my mind, basic shapes, chamfer, fillet, positioning, join, cut. Some apps are just too complicated to learn but nothing is impossible if we are willing to learn it. There are many text and video tutorials on the net, we just need to search for some that explain well.

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  • chienline commented on chienline's instructable CannonBall Shooter
    CannonBall Shooter

    Thank you ^_^After a week I think daddy loves this toy more than his sons :DNeed to invent a better "online game killer". Think think think ^_^

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  • How to Win Prizes at Instructables

    ❤ 。◕‿◕。 ❤

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  • How to Win Prizes at Instructables

    Making and Sharing is the root of Instructables. Winning is the "gasoline" to keep us writing, otherwise some will feel it is tiresome writing on instructables and drop it halfway.With attractive prizes, they will boost us to finish writing what we are initially going to share on instructables :)For me, I was initially use Instructables to archive what I made or some helpful methods I use in daily life (LifeHacks) so that my kids can learn from it and improve it in the future. I joined Instructables even before my country (Indonesia) is in the list of countries eligible for contests ^_^Now.. not that I am out of ideas. My head keep spinning 24/7 and just won't stop xD... but now I have more works to do replacing my parents. That's why I am not that active in Instuctables lately.…

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    Making and Sharing is the root of Instructables. Winning is the "gasoline" to keep us writing, otherwise some will feel it is tiresome writing on instructables and drop it halfway.With attractive prizes, they will boost us to finish writing what we are initially going to share on instructables :)For me, I was initially use Instructables to archive what I made or some helpful methods I use in daily life (LifeHacks) so that my kids can learn from it and improve it in the future. I joined Instructables even before my country (Indonesia) is in the list of countries eligible for contests ^_^Now.. not that I am out of ideas. My head keep spinning 24/7 and just won't stop xD... but now I have more works to do replacing my parents. That's why I am not that active in Instuctables lately. I will keep signing in once a while though ;)

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  • 3D Printed Ludo Set With Box and Dice Tower

    I think it is now being played Worldwide :DYou are welcome ^_^

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    • 3D Printed Ludo Set With Box and Dice Tower
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      2 comments
  • Dice Tower From a Box Plus Dice(s)

    Glad to hear that. Enjoy ^_^

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  • 3D Printed Ludo Set With Box and Dice Tower

    Thank you and have a nice play ^_^

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  • 3D Printed Trellis Clip (designed in Fusion 360)

    Cool! This way I can learn Fusion 360 step-by-step. A very simple and useful lock/unlock ring.

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  • How to Win Prizes at Instructables

    Ups! Looks like I've missed the new rule. I think we can still pick up to 3 contests at the moment we pubish an instructable. So now we cannot enter multiple contests even if our instructable matches the contest's themes? I should have visit Instructables.com more often but too bad I don't have much time now but I will still post once in a while ^_^

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  • chienline commented on chienline's instructable Filament Spool Add-ons
    Filament Spool Add-ons

    You are welcome ^_^

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  • Arduino Battery Voltage Indicator

    Do you mean the I2C adapter module? It is a module that simplify LCD connection to the Arduino Uno. Without it you need a lot of cables and Arduino I/O pins to get the LCD works ^_^

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  • Card Holder With Ejector

    Thank you. I always love wood material and color but it took plenty of my free time with traditional hand tools.For simplicity, now we can 3D print it. There are many models of card ejector wallet (with similar mechanism) can be downloaded for free but you need to choose carefully. We surely don't want to drop our cards ;)

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  • chienline commented on chienline's instructable Sugru Fix My Car
    Sugru Fix My Car

    You are welcome, Sir.Yes I miss those golden years sharing articles on Instructables. Now I am making things with 3D printer, but just don't have much time to spend on writing and taking pictures of the make. No worry for I still keep trying ... ;)

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  • FlatPack Christmas Tree

    Thank you @deonjwessels. Just kept myself busy on this lonely Christmas ^_^

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      • DIY Bass BookShelf Speaker
      • DIY HiFi 200 Watt Audio Amplifier
      • DIY Lithium Battery Charger
  • chienline commented on chienline's instructable M.A.P.S. Keychain
    M.A.P.S. Keychain

    Oops! My bad. Clumpsy me. Yes it is 0.16 mm and I am going to edit my ible right away. Sorry for misinformation and Thank you for pointing it out ^_^

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  • How to Win Prizes at Instructables

    To receive prizes, just prepare an address that is reachable by FedEx. If you live in a small town, FedEx team will contact you to pick up the package at their station in the nearest big city. If you have any families/relatives that live in big city, you can use one of their addresses and the package will arrive at front door for them to sign the receipt on behalf of you.

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  • chienline's entry M.A.P.S. Keychain is a winner in the Make it Move contest
  • chienline's entry M.A.P.S. Keychain is a finalist in the Make it Move contest
  • Free Halloween Mummybot Papercraft

    Who is the scientist in charge of making my sarcophagus? My big belly is surely not fit in this...

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  • chienline's instructable M.A.P.S. Keychain's weekly stats:
    • M.A.P.S. Keychain
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  • chienline commented on chienline's instructable M.A.P.S. Keychain
    M.A.P.S. Keychain

    Actually there are many simple projects to make here on Instructables, but of course most of "Cool Projects" need premium tools or materials. Thingiverse is one story in a building (having room of tools, room of toys, room of gadget, etc.) while Instructables is a plaza (first floor for woodworking, second floor for 3D printing, third floor for craft, and so on...)Thingiverse is sometime like "window shopping" to me (pointing at complex builds and some that need paintings) :D

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  • Arduino Battery Voltage Indicator

    I am not good at explaining math or physics but based on your formula, simple answer would be:BatteryPercantage = (2.36 - readVoltage)/0.7 * 100;realvtg = (readVoltage/2.36) * 7.4;

    "The LED on Arduino Uno board is not lighting up", do you mean the onboard LED (one the same with D13) which we set to be "light up" on low battery (below 4.1V in the code) ...or the LED telling the Arduino Uno board is not running?Are you using the same battery (3.7V) to run your Arduino? Arduino need at least 6V to power up and at least 7V to feed 5V to its I/O pins.

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  • chienline commented on chienline's instructable M.A.P.S. Keychain
    M.A.P.S. Keychain

    Yes, I have an account on Thingiverse :)Only that I love Instructables more, then I posted it here before Thingiverse ^_^Check this out : https://www.thingiverse.com/thing:3886027

    Glad to hear you and your friends like it ^_^

    Ah...My bad. I didn't notice that this is Penolopy Bulnick, then I shouldn't tell you about TinkerCAD, should I? :PI am using FreeCAD with "Part" module. As simple as TinkerCAD, Cut, Fusion, Chamfer, Fillet, and basic 3D shapes ^_^

    You are welcome ^_^

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  • chienline commented on chienline's instructable Peg Hands
    Peg Hands

    Happy making \(^.^)/

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  • chienline entered M.A.P.S. Keychain in the Make it Move contest
  • Lacing Bike Wheel : 36 Holes Hub to 32 Holes Rim

    You are welcome, Chris.Yes you are right about "we need 4 shorter spokes" but I just couldn't get them here in my home town. Thankfully I have double wall rims, so the excessive spokes inside the rim do no harm to the tube ^_^

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  • Your Battery positive lead (the one you are having the voltage measured) goes to A0 pin :)

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      • DIY HANDBUILT PORTABLE BOOMBOX
      • Hand Built Full Range Portable Bluetooth Speaker
      • POCKET SIZED BLUETOOTH AMPLIFIER CUM POWER BANK
  • Yes, why not?24V battery can be fully charged up to 28V or more. Fully charged your battery and measure the voltage with a multimeter. If it is below 30V then you can use 6 resistors with same value for the voltage divider. If it is over 30V then pick 7.Just a little change in the code (sketch), find the line :float voltage = sensorValue * (5.00 / 1023.00) * 2;and change it to :float voltage = sensorValue * (5.00 / 1023.00) * 6;Change the multiplication to * 6 or * 7 according to the number of resistors you use on your voltage divider. We divide the voltage with resistors, then we multiply it back on the sketch, simply like that ^_^

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  • If you failed with 64-bit version, please try the 32-bit version. Windows 64-bit architecture surely can handle the 32-bit app well.

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  • Sorry for late reply. I didn't notice because the email went to "scam" folder (>_<)Yes you can. Use 3 identical value resistors as voltage divider. Then find the code :float voltage = sensorValue * (5.00 / 1023.00) * 2; //convert the value to a true voltage.and change it to :float voltage = sensorValue * (5.00 / 1023.00) * 3; //convert the value to a true voltage.Concentrate on wiring the A0 pin, it is next to the resistor which is connected to the Ground. Search previous comments where I attach photo for the A0 wiring diagram using 24V battery ^_^I guess it has already buried down below ... just keep searching ^_^

    Sorry for late reply. I didn't notice because the email went to "scam" folder (>_<)Yes you can. Use 3 identical value resistors as voltage divider. Then find the code :float voltage = sensorValue * (5.00 / 1023.00) * 2; //convert the value to a true voltage.and change it to :float voltage = sensorValue * (5.00 / 1023.00) * 3; //convert the value to a true voltage.Concentrate on wiring the A0 pin, it is next to the resistor which is connected to the Ground. Search previous comments where I attach photo for the A0 wiring diagram using 24V battery ^_^I guess it has already buried down below ... just keep searching ^_^

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  • chienline commented on chienline's instructable Simple Keychain Tool

    Maybe one day. I have several dead phones in my drawer :D

    Not really my first design. I have several since the printer arrived and I started learning 3D modelling. This is my very first design : Converter Holder Phone Stand Keychain. It holds a micro USB to Type C converter. I need this because I sometimes forget to bring my phone charger and Type C is still considered rare over here, then I need this converter with me all the time ^_^Minimal phone stand for waiting time in restaurants. Keychain means it stays with me all the time :DI do not publish this because there are numerous converter size and shape out there and this build only holds certain shape of converter. I will file it in Instructables later though ;)I also design retainer clip to hold my fat-midrange-speakers on A-pillars in my car. Not holding forever (not strong enough) on bumpy…

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    Not really my first design. I have several since the printer arrived and I started learning 3D modelling. This is my very first design : Converter Holder Phone Stand Keychain. It holds a micro USB to Type C converter. I need this because I sometimes forget to bring my phone charger and Type C is still considered rare over here, then I need this converter with me all the time ^_^Minimal phone stand for waiting time in restaurants. Keychain means it stays with me all the time :DI do not publish this because there are numerous converter size and shape out there and this build only holds certain shape of converter. I will file it in Instructables later though ;)I also design retainer clip to hold my fat-midrange-speakers on A-pillars in my car. Not holding forever (not strong enough) on bumpy rides but they hold longer than those I found in the market and they got rid of Minions in the car :DD

    Avoid using sharp objects because they risk your fingers. Better use pen-tip, paperclip or almost anything around, just avoid sharp ones (^_^ " )I was working on hundreds of them, so I just made one (I think) convenient enough to get my work done :D

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  • chienline's instructable Simple Keychain Tool's weekly stats:
    • Simple Keychain Tool
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      24 comments
  • chienline commented on chienline's instructable Simple Keychain Tool

    Yes for inserting. My initial problem was removing the chain from the ring (-.-")

    Yeah, do it elegantly :DActually my initial design was starship look-alike. I was thinking of simply:hook : the O-ring/chainstab : the ring on the bladeturn : turn the ring I don't have much time to tweak to get a precise hook position, so I made a simple one to finish my keychain project first. This build is open for modification :D

    Thank you ^_^

    Thank you ^_^

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  • chienline commented on chienline's instructable Simple Keychain Tool

    Thank you :)If only one or two I use my fingernail too :D but if we are talking about hundreds, yes you need this ^_^

    Not suggesting to purchase 3D printer for this tiny tool. I use 1g of filament which costs less than 1 cent and 10 minutes printing time. If someone need this they can just find any 3d printer around the neighborhood and I bet they will print one for free or give you a grin if you pay a dollar.This is the reason I purchased a 3d printer, print anything that solve my problems. I just love thinking and tinkering :)About the keychain project, it worth 10 rolls of filaments and I only used no more than 1/3 for each roll. So, the rest are now free or I can make more money from them to pay my printer off ;)

    Thank you My Friend :)116 doesn't mean anything but just saving my harddisk space by uploading them on Instructables (cloud) haha..Just enjoy thinking and tinkering :D

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  • The maximum voltage on Arduino analog pin is 5V. That pin has 10-bit reading = 2^10 = 1024. It means that the analog pin reads value between 0 - 1023. Let's say our battery has 8.2 volts left in it. 8.2V is beyond maximum of Arduino pin voltage which is 5V and it will fry that pin if plugged directly. So we need a pair of resistors as voltage divider which divides the battery voltage to 8.2 / 2 = 4.1V.That 4.1V is read by Arduino pin as : 4.1 / 5 * 1023 = 839 (rounded).Now we try to calculate back that sensor reading value to voltage :839 * (5.00/1023)* 2 = 8.20136852394 (according to my 12 digits calculator)The number 5.00 (five point zero zero) will round the value to two decimal digits.If we have 10V battery, the pin reads 5V (after voltage divider), the digital number read by Arduino …

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    The maximum voltage on Arduino analog pin is 5V. That pin has 10-bit reading = 2^10 = 1024. It means that the analog pin reads value between 0 - 1023. Let's say our battery has 8.2 volts left in it. 8.2V is beyond maximum of Arduino pin voltage which is 5V and it will fry that pin if plugged directly. So we need a pair of resistors as voltage divider which divides the battery voltage to 8.2 / 2 = 4.1V.That 4.1V is read by Arduino pin as : 4.1 / 5 * 1023 = 839 (rounded).Now we try to calculate back that sensor reading value to voltage :839 * (5.00/1023)* 2 = 8.20136852394 (according to my 12 digits calculator)The number 5.00 (five point zero zero) will round the value to two decimal digits.If we have 10V battery, the pin reads 5V (after voltage divider), the digital number read by Arduino pin is 1023 (max). If we stick to the 10-bit (1024) in the formula, we will get :1023 * (5.00/1024)*2 = 9.99V, and we will never get the 10V. That is why it is 1023 in the formula ^_^

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  • chienline commented on chienline's instructable Simple Keychain Tool

    So are mine :DI started working on this tool after detaching 20++ keychains and my fingernails started screaming ... >.<

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  • Yes it is. There was about 0.1 volt difference compared to (my) multimeter but it had stable result on several tests. Then I could simply reduce 0.1V in the code, but I left it as is. If you want higher accuracy, collect test data to count average voltage lost in the measurement and adjust the calculation in the code (like simply reduce the result with 0.1V) to get the same result with your multimeter.

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  • Thank you. Recording the time and voltage can be done in the sketch, but you need to add SD card module (check it here). The internal rom has limited space and also limited write cycles. You can learn about that in Arduino official web.

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  • You have such a big hub, then yes you need shorter spokes. It's been four months and I guess you have figured it out or get a new 36 holes rim :DAnyway, experimenting is fun and my bike still serves me a good ride until now :)

    Normal riding, no issue so far ^_^I think only 4 spokes out of 36 will bring little to no effect on normal riding. If you go extreme sport, well, better pick appropriate gears for that purpose :D

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