My students often blame the photon when their software does not work, which is silly since there are so many other things that might be wrong, however after teaching 3 semesters using the Photon it is possible that the occasional photon pin might be messed up. Has anyone made a photon test PCB and i…

@rocksetta , making a jig with a known-good Photon and a target Photon makes sense. For UART testing, a simple loopback (TX connected to RX) is all that’s needed on the tested Photon. Otherwise, a simple echo test between the testing and the tested Photon is good as well. The Photon now supports b…

So I have started to design my Photon Testing PCB board. Actually presently working on the code to flash to the Photon in question. I really want to be able to test a photon that has cloud connectivity but perhaps a dead pin. Question: What is the most likely pin to die? Anyone at Particle know wha…

I am testing all the GPIO pins, by setting the next higher pin to an output and then reading for both HIGH and LOW on the present pin. Bit strange connecting every single GPIO pin together, but it seems to work. Even spotted the error in my logic with D7. The original code connected it to D8! [im…

So this seems fine for DAC testing. Was a bit more code than I was expecting. void myTestDAC(){ // String myDAC1Good = "Bad"; //decalred as a global variable // String myDAC2Good = "Bad"; // declared as a global variable int myDacRead1000, myDacRead2000, myDacRead3000; String myDac1Output,…

I really like the new revision share particle system for when I have a problem and need help, but this program is changing very quickly I think the only way to working with it is from a github site. Sharing a revision is probably a great way to store a working backup that people can look at. Here …

So I have PWM and AnalogRead Photon testing working on A5-A1 and A4-A0. Still makes me nervous connecting all these pins together by setting them to INPUT when not using them, but it seems to work. The basic concept here is to use PWM to turn on an LED to 3 levels, then use- AnalogRead to read the …

@rocksetta , you could simply connect an analog (PWM) output to a digital input and use pulseIn() to measure the pulse width for different analog output values. Or use interrupts to measure the ON/OFF times. This is more accurate and simpler than your proposed approach IMO. :wink:

[image] peekay123: connect an analog (PWM) output to a digital input and use pulseIn() to measure the pulse width for different analog output values. My way made a lot of sense until I saw how finicky the results were. Your way makes much more sense now. Thanks :slight_smile: Interesting: pu…

How to fully reset a DAC pin? I have a weird situation with the DAC’s: I have expanded my DAC test to test all the analog pins. My code for both DAC1 and DAC2 works great to test all of the other analog pins (So I use DAC1 to test A3 and DAC2 to test A6). But strangely I can’t run both tests one a…

Don't know why I have to write a question on this board before I think of a solution. :grinning: It looks like this works to fully de-activate a DAC pinMode(DAC1, OUTPUT); analogWrite(DAC1, 1000); // activate DAC digitalWrite(DAC1, LOW); // set DAC pin low NEEDED! pinMode(DAC, INPUT); //…

Photon Test Breakout Board

Hardware

rocksetta June 12, 2017, 4:49pm 24

Thanks Rick. Very happy. Got my SPI both master and slave working really well.

I posted my code at

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Photon Test Breakout Board

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