@engineerjSorry, I made a mistake by suggesting you a single big power supply for all channels. There would be cross current from one channel to the o...

Wow! a pretty cool idea to drive your legs muscles with electrodes controlled by a program and to be able to walk or to ride a bicycleAlthough, I thin...

Hi @engineerj I just calculated the necessary Voltage (Ohms law is the secret) to drive 140mA over 10k skin resistance. The voltage required is 1.4 ...

Hi @thephilnewmanthere is annother aspect which is quite nasty when you use stepper motors. The spindle will resonate at its base frequency and intege...

Hi @me-chiel most probably you need an extra 5V power source to drive the schmitt trigger and the relay. I don't think it can be done with only 3.3...

@nicolas, on your photo it looked like a kind of neon - gas - discharge bulb. When you can light it with 3.3V it is most probably an incandescent lamp...

@Robert1952 For reference the above code is from helitus on the Arduino Forum when I understand helitus' blog right - this code sample is used...

@Robert1952 Provided you did not wire GND loops, which would kick the Arduino into an undefined state, as soon the motor draws some significant curren...

@robert1952 Hi Robert, there are about a million and one possibilities why your project may not work. Can you supply a wiring diagram and the sketch y...

@nicolas The part where you pointed Transistor 4, 5, 6 and 7 seems to be a coil less boost converter (the neon bulb needs about 50V). Zero Ohms on bas...

@zander Wow!! I'm really impressed! According the huge amount of your contributions to this forum, I didn't expect you 81

@zander Yes! what a coincidence... For the preparation of my own project's specification (details will come when I'm ready) I've studied all ESP32 I2S...

@psychique The "swiss army knife" ( swiss is meant literally in this case ;-) ) for everything concerning I2S streaming, you'll find on I'm quite sure...

@bunnykillerin case you are not already aware of this website... I think it covers all solutions you need for your project on the digital/software par...

@henrik_t7 I'm not sure what you intend to do with shift registers. For driving serial 7-segment displays from an arduino, you just need a "rgbdigit" ...