TechKiwiGadgets

Nice work

HiCheck that the Real Time Clock Board is installed correctly and that the time library is installed. Also note the version of IDE I have used in the notes.

Hi the sw is designed for this specific size touch screen.

Very cool nice work. Great ideas. Ive experimented with hot glue as a medium for LED diffusion on items which works well.

Cool well done. Please share Pic!!

Nice Work I will add these to the instructable if thats ok and others can use.

Nice work

Awesome clock. Nice work.

hiIt looks like the LCD display libraries have not been loaded into the IDE.Try downloading and installing them again and let me know how you get on.

hiYes I did try this and there was not a noticeable improvement. I am experimenting with other coil designs to try and improve sensitivity.Will keep you posted.

No probs glad you like it.

I have had a number of questions about the operation of the LM339 so I thought I would give a more clear explanation.The LM339 operates solely as a voltage comparator, comparing the differential voltage between the positive and negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input differential polarity.In this circuit, the positive input of the comparator is connected to the Vcc line and a pull-up resistor to Vcc is applied to the comparator output. In this configuration, in practice, the output voltage of the comparator stays high, until the input voltage on the negative input exceeds 3.5vThe operation can be explained from the LM339 Data Sheet which outlines the “input voltage range” being between 0 V to Vsup-1.5 VWhen both ...

I have had a number of questions about the operation of the LM339 so I thought I would give a more clear explanation.The LM339 operates solely as a voltage comparator, comparing the differential voltage between the positive and negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input differential polarity.In this circuit, the positive input of the comparator is connected to the Vcc line and a pull-up resistor to Vcc is applied to the comparator output. In this configuration, in practice, the output voltage of the comparator stays high, until the input voltage on the negative input exceeds 3.5vThe operation can be explained from the LM339 Data Sheet which outlines the “input voltage range” being between 0 V to Vsup-1.5 VWhen both IN– and IN+ are both within the common-mode range, if IN– is lower than IN+ and the offset voltage, the output is high impedance and the output transistor is not conductingWhen IN– is higher than common mode and IN+ is within common mode, the output is low and the output transistor is sinking current.Link to Data Sheet and explanation belowhttp://www.ti.com/lit/ds/symlink/lm2901.pdf

If you have connected the LDR there could be an issue with it blanking the backlight. 1. Ensure the Zener Diode polarity is correct. Then end without the band is the anode which should be connected to earth.2. The LDR circuit could be incorrect. Try connecting Pin A7 to VCC and see if there is any change in the screen activity.Let me know how you get on.Techkiwigadgets

hi The code shold load and display the background with no RTC or sound board connected. It sounds like it could be a backlight issue. Can you direct mestage me photo of physical setup and I will try to assist.

Thanks glad you like

Yes thanks good idea

Hi, try reversing the polarity of either the TX or RX coil to see if this fixes the problem. If not, place a 150pf capacitor across the TX coil and a 150pf capacitor across the RX coil as this helps in many cases. Message me if there are further issues.

Thanks, glad you like :)

Very cool well done

Great thank you. I'm glad you like.

Thanks for the feedback. Am glad you like.

Yes I did experiment with different options. This config seems to work well. Have a look at the ocilliscope traces in the Build and Test step to have a closer look at the circuit behaviour.

Hey my apologies the link is now fixed. Ali Express is a place I am ordering from for these units now.See section 4.4 for commentary on the three different screen types that are typically available and how to identify and configure for variations.Let me know if you need any other help

Hi the LM339 +Vcc pin should be connected to the 5v regulated power supply on the Arduino. Try this and let me know how you get on.

The pcounterA value should be much higher 200 to 800 at least. My advice is to focus on one channel. Try reversing the polarity of one of the coils as this often is the problem as the pulseIn function needs to have a clean leading edge to trigger the timing process. Ensure your breadboard connections to the coil are short and well grounded. If this does not work direct message me with a link to some photos of your setup and I will try to assist. Im just building a second unit so your timing is fortuitous as I can provide some test measurements.

HiThe instructions cover most of these points.The Mega is connected via a screen sheildMessage me directly on any questions I will try to help.

I had problems sourcing screens locally so now use Ali Express. Here is an example supplier here https://www.aliexpress.com/item/Free-shipping-3-2-...

I haven't tried either because I the Mega has more memory and drives the screen through a parallel interface which means the graphics are fast.My recommendation would be to stuck with the current design as I wouldnt be able to assist if you ran into any issues.

HiYou need a USB-A cable which ideally is 1.5 to 2.0 m long so the clock can be on a bedside table and the wire is long enough to comfortably reach the USB charger plugged in a wall.A good example is here https://www.pbtech.co.nz/product/CABDNX6001/Dynami...

HiYou need a USB-A cable which ideally is 1.5 to 2.0 m long so the clock can be on a bedside table and the wire is long enough to comfortably reach the USB charger plugged in a wall.A good example is here https://www.pbtech.co.nz/product/CABDNX6001/Dynami...

HiThe algorithm I used approximates the direction and could be modified to accomodate the servo direction.I would also suggest adding a low pass filter in the code to remove sudden variations so you get a smooth transtion to the direction of source noise.Message me with a link to your code if you need any assistance.

HiIn theory as a general rule the size of coil, higher the current and number of turns the greater the depth. However in this circuit I tried a few options and the current circuit parameters gave the best performance.The last section of the instructable discusses various coil options that may be worth pursuing.I would recommend replacing the four TX BC548 transistors for a 2N7000 FET as outlined in my instructable (Pin-pointer Metal Detector) as this provided some improved sensitivity.Otherwise its a case of trial and error using a bread board before your final build.Message me if you need any help!

Looks awesome nice work. I really like the cases and use of color.

If you connect shield and display then load code you should at leaSt get the main menu displaying.

Thanks

Hi, sure thing. The power bank I'm using cannot charge and deliver power to the circuit simultaneously, however, I have noticed that if you start the LED Gyro Sphere using the power switch then insert the USB cable into a PC the Powerbank either accommodates this or switches off the battery and supplies directly from the PC USB cable. I will update the instructable circuit with a pin out diagram. Hope this helps.

Thanks, am glad you like. Hopefully will have new effects published in the next 48 hours.

Hi, you can load the code at any time and test. There are Arduino Training Tutorials on Instructables that walk you through setting up the IDE software and connectivity to the Arduino. If you are still having issues message me and I will help out. :)

Wow that font looks great. Id like to link your design to the instructable if youre ok with this so others can use similar hardware. Thanks for the feedback on coding and result. Im about to release a new instructable so check it out in next 12 hours and vote please!!

Nice work. Let me know if you have any questions! If you send link to STL files I can add to instructable. Well done :)

Actually my apologies I double checked and its actually 2200mha Power Bank. Ive updated the parts list with a link to the supplier. I suspect you can get on amazon or aliexpress. I'll update circuit diagram with changes.

Yes the author of the LCD driver has a tool you can use to create your own fonts!! This is found on the site mentioned here http://www.rinkydinkelectronics.com/r_fonts.phpGood luck and well done!!!

Ha ha my favorite tape measure too. Sounds like a good application of the detector.

Also there is sound and vibration built into the unit as well !!

Great ideas thanks. I agree a smooth surface would be better. I was originally planning a 3D case however my 3D printer smoked over Xmas. There is an opportunity for another maker can build a 3D for their build!!

Thanks glad you like. Yes great idea.

Hey, these look fine. Good luck with the build. Message me if you have any questions.

Wow, nice work!!!! Fantastic this means others can use these displays as well.Thanks for the kind feedback.You should be able to increase the Digital Clock Font easily as well. Im very impressed!!

thanks

Hey I tried to show depth in the video which is about 30mm from the coils for a small coin. The intention is that you use this to pin point in a small area as opposed to do deep search of objects ts. However I am trying a few different coil confidential to improve depth.

No problem a good question. The resistors are in series with the LEDs so whether on the Cathode or Anode does not matter they will limit the current. The LEDs are only activated individually when the X and Y coordinates in the matrix are correctly supplied by the Arduino so this removes the need for resistors on both Anode and Cathode side of the matrix. Hope this helps and good luck with the build.

HiGo to the end of step 2 in the instructable. Ive just uploaded a full Circuit Diagram in PDF format. The file name is 'Four Coil MD V5.pdfYou should see this just below the parts list.The other PDF diagram you mention is just to show waveforms for a single channel. I had a request from another maker who wanted to view on an oscilliscope.

Hi, thanks glad you like. Ive included a PDF of the circuit diagram in Step 2 so you can download,, print and view easier.

glad you like. It's easier than it looks.

? glad you like. It's easier than it looks.

? glad you like. It's easier than it looks.

? glad you like. It's easier than it looks.

nice work. Very cool idea

Hey no probs. I’ll message you my email address and lets see if we can resolve. I have a new digital storage scope so can use this to capture further waveforms that may be of use. ?

Thanks for the feedback

Hi am happy to help.Firstly 65v peak voltage sounds rather excessive so please confirm your power supply to the Arduino circuit is set to a maximum of 12v.Connecting one TX and RX coil initially for testing is a good idea for testing purposes.Step 4 has specific test code that should display the pulse width of the received pulse for end to end testing purposes. Could you please take some photos of your setup, load this code and message me the results.The Scope frequency settings used for Step 4 were 2mS per cm show approx 6500 uS pulse width in the photos (3.5cm pulse width on lower trace).

Great idea putting a hole in for camera shots.

Nice work looks awesome!!

My pleasure. Glad to hear it all worked well.