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kamil47

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  • Contact Digital Thermometer With Deep Sleep [Attiny85]

    Nice project,but can you provide complete code - ino file?

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  • Li-ion Battery Bluetooth Scoreboard

    Hi,it is good idea not to use relays.Battery holder iclude all electronic for battery care and provide stable 5V output.Please click on link assigned to the batteries holder and you would see all details. In this case is not necassary to make the batteries removable.But now, there is one more solution, how to power the Scoreboard.Double output power convertor is available. It is a small PCB, with input 5V and double output adjustable to +5V and -5V. You can mount it inside the Scoreboard and power whole instrument from classic socket adapter 220V/5V, 1A. You do not need to care about batteries and Scoreboard is safety (just powered from 5V).Kamil

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  • Li-ion Battery Bluetooth Scoreboard

    High rockthorn,I wish you good luck. Scoreboard is really fantastic and you will enjoy it.I recomend you, the first version, directly powered from main power. You do not need to charge battery very often.Scoreboard Lithiom-Ion is second version. This construction is more simple due to big print circuit board, but according my experiences there is long time for battery charging. If you charge batteries out of scoreboard it could be faster. There is also problem with too complex power supply and relay. It is working very well, but if relay suddenly got faulty, it could destroy battery.I am working on better solution, maybe you can modify electronic scheme:Use large PCB everything as it is in Lion-b. version. Modify batteries and power parts. Instead of power supply with relays and two block…

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    High rockthorn,I wish you good luck. Scoreboard is really fantastic and you will enjoy it.I recomend you, the first version, directly powered from main power. You do not need to charge battery very often.Scoreboard Lithiom-Ion is second version. This construction is more simple due to big print circuit board, but according my experiences there is long time for battery charging. If you charge batteries out of scoreboard it could be faster. There is also problem with too complex power supply and relay. It is working very well, but if relay suddenly got faulty, it could destroy battery.I am working on better solution, maybe you can modify electronic scheme:Use large PCB everything as it is in Lion-b. version. Modify batteries and power parts. Instead of power supply with relays and two blocks of 5V holders with charger, use dual power supply adjustable type DD39AJPA eletechsup, (dc-dc buck bust) and adjust it on output at +5V and -5V at input 12V. Input 12V could be wired to power jack connector on frame of scoreboard and powered by any standard external main power adapter dc12V, 1A. In this case is instrument safety and not connected to ac 220V.There is also possibility to add holder for three Li-ion batteries inside and charge it from available 12V (if scoreboard is not used) and power it from this battery, if it is used. How to solve switching between modes of this power supply, it is under development.I am not sure about software version which is here at Instructables, but I have a newest one with fixed all problems. I would modify it here soon.Give me message in problems or if are you satisfied if you made it.

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  • Li-ion Battery Bluetooth Scoreboard

    Hi,M1 means 0.1 microFarad, or 100 000 pF10M means 10 microFarad or 10 000 000 pF4700 means 4700 microFarad or 4 700 000 000 pFHope this could clarify value of capacitors.

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    • Li-ion Battery Bluetooth Scoreboard
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  • Visual Basic Arduino Interface

    Congratulation, you have done a perfect job. Very nice and clear explanation and the best introduction to VB coding as well.Thank you.

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  • kamil47 commented on educ8s's instructable ESP32 Deep Sleep Tutorial
    ESP32 Deep Sleep Tutorial

    Hi,you can find it at any e-shop, like aliexpress, ebay or banggood. It is for 5V,6V, 12V output with name 18650 Lithium Battery Charging UPS boost module. Here is link for one of them. https://www.banggood.com/5V-218650-Lithium-Battery-Charging-UPS-Uninterrupted-Protection-Integrated-Board-Boost-Module-With-Battery-Holder-p-1444382.html?rmmds=search&cur_warehouse=CN

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  • kamil47 commented on educ8s's instructable ESP32 E-Paper Thermometer
    ESP32 E-Paper Thermometer

    Ahoj Jozef, je to perfektné, kedy to zverejníš? Nemas viac podrobnosti k Wifi Weather Station? Najviac ma zaujíma ako sa vyrvorí bitmap pre E-paper display, tie návody sú nejasné. Ďakujem

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  • kamil47 commented on educ8s's instructable ESP32 Deep Sleep Tutorial
    ESP32 Deep Sleep Tutorial

    Hallo Nick,I appreciate your projects, good topics and nice explanation.I have made E-paper display thermometer. Now I am testing ESP 32 with Deep Sleep and with thermometer. It is working but thermometer is booting together with ESP-32. Probably memory problem, everything (code) should be in RTC? How to put all code of the E paper thermometer to RTC or what is not necessary to be in RTC? If you have function code for E paper thermometer with deep sleep I would be happy.By the way, there is available nice Li-ion battery holder, for this project. including charger

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  • kamil47 commented on educ8s's instructable ESP32 E-Paper Thermometer
    ESP32 E-Paper Thermometer

    Very nice project, I have tested the display is really miraculous. But I spent some hours to compile it. There were many errors and I went through all code lines, disabling and enabling them and finally have found a problem. Three lines 8, 9, 10 with "include" command, extension .cpp should be replaced by extension .h. Than compilation was OK.

    Hi,try to replace extension .cpp by extension .h. It is in lines 7, 8, 9. Just in these three lines. Everything else should be OK.

    I would like to know some more about display, how to control pixels, how to modify text on display, how to create bitmap file for it and so on. All available details are not very clear. Have you any ideas?

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  • kamil47 commented on kamil47's instructable Arduino Zener Diode Tester
    Arduino Zener Diode Tester

    Hi jensGSYou are right, the values for trimers are calculated for 1.25V on LM317 in CC mode. But these values are just informative. Real values are different, depend on impedance of surrounding components and you must consider that for small current values around 5mA, LM317 is working on its limits and formula is not valid. Values for trimers in published schematics are good and were updated according tests on breadboard.But there is very nice feature in my project: Service mode. In this mode you can adjust all currents - trimers very easy in simple way. Do not forgot to use high voltage LM317, if you can select, choose one with higher voltage by measurement.I had problems with relays. some of them are poor quality and contacts remain switched ON always after a few cycles. Choose higher q…

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    Hi jensGSYou are right, the values for trimers are calculated for 1.25V on LM317 in CC mode. But these values are just informative. Real values are different, depend on impedance of surrounding components and you must consider that for small current values around 5mA, LM317 is working on its limits and formula is not valid. Values for trimers in published schematics are good and were updated according tests on breadboard.But there is very nice feature in my project: Service mode. In this mode you can adjust all currents - trimers very easy in simple way. Do not forgot to use high voltage LM317, if you can select, choose one with higher voltage by measurement.I had problems with relays. some of them are poor quality and contacts remain switched ON always after a few cycles. Choose higher quality relays. I did selection on breadboard, using arduino and simple code. Relays were switching ON and OFF in 1s intervals for a few days. About 50% of them were after this test thrown to electronic garbage. I wish you Good Luck.

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  • kamil47 commented on kamil47's instructable Arduino Zener Diode Tester
    Arduino Zener Diode Tester

    Hallo JensGS,you are right, there is common GND for 5V and 12V , the first module. I was tested all parts connected on breadboard at first and I had a problems with voltmeter, if its power voltage was not isolated. But you can try. I knew that diode inside voltmeter could be disconnected and you can convert 2wire to 3wire. In this case it is O.K. you have 3 wire voltmeter. If original one is not available, you can use any voltmeter. The best one is with 1 decimal point over 10V and 2 decimal points below 10V (like 12.5V or 6.56V).If you order parts be careful about relays. Some of them are not good quality.Concerning Gerber file. I was using JLCPCP viewer today and check file on that web page. It was OK. There was not any error indicated. But anyway, there could be some error. The first v…

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    Hallo JensGS,you are right, there is common GND for 5V and 12V , the first module. I was tested all parts connected on breadboard at first and I had a problems with voltmeter, if its power voltage was not isolated. But you can try. I knew that diode inside voltmeter could be disconnected and you can convert 2wire to 3wire. In this case it is O.K. you have 3 wire voltmeter. If original one is not available, you can use any voltmeter. The best one is with 1 decimal point over 10V and 2 decimal points below 10V (like 12.5V or 6.56V).If you order parts be careful about relays. Some of them are not good quality.Concerning Gerber file. I was using JLCPCP viewer today and check file on that web page. It was OK. There was not any error indicated. But anyway, there could be some error. The first version was with errors and the second version, as I remember, there was not error (it was corrected). But I am not sure about it. I have some boards free and I can sent you one.

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  • kamil47 commented on kamil47's instructable Arduino Zener Diode Tester
    Arduino Zener Diode Tester

    Hallo JensGS,it is not so simple with power supply voltages, as you think. If you power two different electronic circuits from one supply, there must be common reference point, like ground! This is basic must rule and if you not accept it, you can destroy components and power supply!Arduino is powered from separated Power supply 5V and must be powered separately because its sensing resistor R2 is not connected to GND. Arduino meassure voltage on this resistor and GND for Arduino is on one side of this resistor and it is Logical GND and totally different as GND for other circuits. If you connect Arduino GND to other GND circiuit, you 100% destroy MCU or something else. (It is short circuit state). The same rule is valid for LCD Voltmeter. The voltmeter must use isolated power supply, to s…

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    Hallo JensGS,it is not so simple with power supply voltages, as you think. If you power two different electronic circuits from one supply, there must be common reference point, like ground! This is basic must rule and if you not accept it, you can destroy components and power supply!Arduino is powered from separated Power supply 5V and must be powered separately because its sensing resistor R2 is not connected to GND. Arduino meassure voltage on this resistor and GND for Arduino is on one side of this resistor and it is Logical GND and totally different as GND for other circuits. If you connect Arduino GND to other GND circiuit, you 100% destroy MCU or something else. (It is short circuit state). The same rule is valid for LCD Voltmeter. The voltmeter must use isolated power supply, to separate measuring circuit from other part. Using 2 wire Voltmeter is not possible. 2.wire voltmeter is powered from circuit on which is measurement done.and is working from 4V or over. What is extra, it is taking current about 10mA from measured circuit. In such a case you can not measure Zener voltage below 4V, but you cannot use 2 wire voltmeter for resistor with current about 5mA absolutely. All mentioned problems are described in my article. If you read it, you would better understand why construction is designed such a way, as it was done. There are also sentences concerning Step Up modules. Using them create some more problems and construction should be much bigger in size.Gerber file is not a perfect but must be OK. Clearances between tracks are acceptable and PCB done according gerber file was used for the prototype.

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  • Small Variable Power Supply

    Hi m3vuv,I agree, it is not a perfect one, there are some problems, like you have mentioned spark and so on.. But it is cheap and simple construction. It should be also safety because of using main transformer. Anyway, thanks for comment.

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  • kamil47 followed myless8
      • ATTiny Port Manipulation (Part 1.5): DigitalRead
      • ATTiny Port Manipulation (Part 2): AnalogRead()
      • ATTiny Port Manipulation (Part 1): PinMode() and DigitalWrite()
  • Nice and useful project. To program ESP8266 01 without programming board is not so easy. But anyway, can you provide some schematics? I can follow and trace wires from the breadboard (STEP 5), but I prefer to clearly see how components are connected.

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  • It is very nice idea and good working circuit, but I am not very sure, if it is good for charging battery?.There are 2 problems. The small one, Led diodes could not light. The big problem is voltage detected by transistor. It is not a battery voltage! (Battery voltage should be increased and should initiate cut off function.) If charger is using constant current, battery voltage is the same like battery, but after cut off, voltage of charger depends on its electric properties and could be different like battery voltage. In some cases can recycle charging.

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  • Hi NetZener,thank you for thorough comment. You are right about some weeks points, but I need to explain some properties of my design:24V separated power supply for fan was used, because I did not want to charge both 24V outputs (in series) by asymmetrical load. In that case is internal resistance different and can depreciate output parameters.Circuit for fan I was using, was as simple as possible. The reason is that fan is not very necessary, just in a few cases of big (low resistor) load. But I agree, if it must be perfect it should be other circuit.Mounting both 24V boards together through PCB holes is dangerous, I agree. Boards should not be connected!Concerning output current. In Banggood specification for 24V power supply is stated 4 to 6A, but if power is to 100W. It means for volt…

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    Hi NetZener,thank you for thorough comment. You are right about some weeks points, but I need to explain some properties of my design:24V separated power supply for fan was used, because I did not want to charge both 24V outputs (in series) by asymmetrical load. In that case is internal resistance different and can depreciate output parameters.Circuit for fan I was using, was as simple as possible. The reason is that fan is not very necessary, just in a few cases of big (low resistor) load. But I agree, if it must be perfect it should be other circuit.Mounting both 24V boards together through PCB holes is dangerous, I agree. Boards should not be connected!Concerning output current. In Banggood specification for 24V power supply is stated 4 to 6A, but if power is to 100W. It means for voltages until about 33V (2x100W) it could deliver 6A. I have tested it and it is true.Output voltage is OK, more than 42V, it is just above 43V.Ripple for Ruideng should be less than 100mV according some testing on YouTube, for 24V module is not tested. Anyway I agree, for very sensitive circuits it is not the best power.Kamil47The best choice is DPS5005.

    I was looking to your power supply. It is unbelievable. Not just electronic solution, but your whole Instructable. Such perfect and professional processing I had never seen. You should spent many hours on it. I would write some comments directly. Congratulation.Kamil47

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  • Very nice project with clear explanation.Just missing battery type and scheme of connection Wemos to Accelerometer.

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  • Vary nice and useful Instructables. But can you write, which type of photo-sensitive board do you use, or where you can buy it.

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  • kamil47's instructable Mailbox and Garage Door Notifier's weekly stats:
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  • I agree, your solution can save battery life. It is very good idea to use transmitter and receiver at 315MHz. But there is disadvantage in larger antennas and still distance range could not be very far.Thanks for alternatives.

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  • kamil47 commented on fortzero's instructable PCB Exposure Unit

    Very professional project. Can you shortly describe a method to produce PCB by exposer unit. I know, it should be a photo, but which type of material do you use?

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  • To use WiFi is very good idea. But there is a problem with accessible range. Extender is the best solution, but making project more complex. Very good inspiration is ball bump switch. If you can send exact type of switch, it can help. Switch is weakest point in my project. It is reliable but difficult to adjust. Another problem is: can ball bump switch detect very light weight letter?Anyway, I am curious to programming code for your solution, and thanks for inspiration.

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  • Yes, you are right. I did not realized that voltage from negative rail. It means, negative voltage is not created with DC input.Thanks

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      • Small Variable Power Supply
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  • Hi Jakub,I would send it. You can modify it in Sketch (Accessories for painting in Windows10). There is same transparent foil covering front panel paper. This foil is dedicated for binding documents with gear linkage. Both paper and foil are soot in plastic upper and lower cover.

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  • kamil47 commented on johanmoberg's instructable Mailbox Notifier

    Hi! I have made this project with small differences: Sender is activated by two switches, mailbox and garage door. (The same building about 50m away from house). In this case using Attiny 85 is little tricky. Receiver MCU is Arduino Nano or Attiny 85 and notification lights are two LEDs only.I am asking you for permission, to write Instructable about changes, comparing to your project. I would write link with address to your Instructable as origin project. If you agree, please give me an answer. Thanks.

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  • Hi MillennialDIYerFinal cost is 20 to 25 € except transformer. The best solution is to use some old transformer. Time about 6 hours. Most time you spend by modification of plastic cover. Electronic connection is simple, because you do not need make some PCB.Concerning e-shop parts. Aliexpress has a huge choice of electronic parts concerning to Banggood, but I prefer Banggood for PayPal possibility and sophisticated graphic design of web page. If part is not available on Banggood I choose e-Bay. I think e-Bay is safety with a huge choice. I do not know parameters of tattoo power supply, but I have found the best DIY power supply. It is fantastic, it is RUIDENG DPS50V15 DPS5015 Programmable power supply. I have bought it in some promotion action for about 20,-€ at Banggood. I have…

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    Hi MillennialDIYerFinal cost is 20 to 25 € except transformer. The best solution is to use some old transformer. Time about 6 hours. Most time you spend by modification of plastic cover. Electronic connection is simple, because you do not need make some PCB.Concerning e-shop parts. Aliexpress has a huge choice of electronic parts concerning to Banggood, but I prefer Banggood for PayPal possibility and sophisticated graphic design of web page. If part is not available on Banggood I choose e-Bay. I think e-Bay is safety with a huge choice. I do not know parameters of tattoo power supply, but I have found the best DIY power supply. It is fantastic, it is RUIDENG DPS50V15 DPS5015 Programmable power supply. I have bought it in some promotion action for about 20,-€ at Banggood. I have checked it and is really top. Powerful and precise.

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  • Hi, it is very nice and simple project.I hope, Arduino Uno could be replaced by Attiny 85, to make it more economical and smaller. There are only 2 pins (except voltage) : pin 9 which is PWM, it could be physical pin 5 or 6 on Attiny and pin 2 (serial communication to sensor), this could be physical pin 2 or 3 on Attiny. What do you think?

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  • Very nice description of esp 8266, but I did not find answer for following question:Do I need install some driver for NodeMcu Lua ESP8266 ESP-12E with Arduino IDE. I have got the same board from Banggood, but there is mentioned some web address for downloading driver?

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  • kamil47 commented on medhatko's instructable Zener Tester

    Very nice project. 7812, 12V regulator is used to power voltmeter, but LM317 function is not clear. What is LM317 for?Voltage for Zener diode is slightly dependant on diode current. I suggest to measure voltage drop on resistor 4k7 and calculate current or measure current directly. Or the best solution is to alternatively switch two resistors in series with Zener diode and measure Zener voltage for two current. (Small current Zener diodes and more powerful Zener diodes.

    Hallo, thanks for explanation. You are right, there is current limitation done by LM317 for about 1.5A. But LM317 is in this case useless. There is resistor4700ohms in series with Zener diode and protecting this diode. Assuming that input voltage is about 47 V and and points for Zener diode are shorted, there is maximum current 10 mA.

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  • It is very interesting. I appreciate the step three, because I need blinking function for two Leds. I must try this code and I hope both Leds would blink in Vice versa way.

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