I purchased a HX77 from Sparkfun recently and I’m trying to make it work with an Arduino UNO. I’ve followed the wiring diagram and checked it twice. Unfortunately when I connect the VDO and VCC to +5V and the GND to GND on the Arduino it appears to short out the board. The board loses it’s yellow light and disconnects the USB from my computer(ba-deep). Disconnect the power leads and ba-deep my computer reconnects. I’ve measured across the two terminals on the HX77 and get 10K Ohms. So it’s not a complete short. Do I need more power from my USB port? A resistor somewhere? External power source to the Arduino?
10K ohms is super far away from a short circut and would not cause the issue you’re seeing. Please attached a picture showing how you have the board connected to the arduino.
Do you mean the HX711?
By VDO do you mean VDD?
I’ve measured across the two terminals on the HX77
Which two? Please post a photo of your setup, as requested.
I suggest to get the load cell/HX711/Arduino working in isolation before adding all the other stuff.
You don’t need an external power supply for that, but a stepper motor certainly does. It is impossible for forum members to determine exactly what is going on in the last photo posted.
Hi @pfabricy ,
It looks like you are using a L298N Dual H-Bridge Motor Driver to drive a stepper motor? That is unlikely to work. The board you have is designed to control one or two DC motors in H-Bridge configuration. The ST L298N datasheet shows how it is possible to drive a stepper motor, but you need an additional L6506 or L297 to monitor and control the motor current. In your circuit, you have no way to control the current through the stepper motor windings. That is probably why your L298N is hot and needs fan cooling?
I hope this helps,
Paul