Hello to all!
I need some help about my project. My project is a thrust stand data acquisition shield that i made to characterize the actuator group of a quadcopter. In particular, this shield give me the measure of the following quantities: the current absorbed by the motor, the voltage across the battery, the thrust generated by the propeller, and the speed of the motor.
For doing this, i have used this components:
- ACS712 - 30A, to measure the current
- INA125P and a load cell, to measure the thrust
- Resistor Divider, to measure the voltage
- Diy optical encoder, to measure the speed of the motor
I'm using Arduino to acquire the datas, so i can process them using Matlab.
Following the datashees of the components, I have done a circuit. I have tested a part of this circuit on the breadboard. This ciruit is compose of the INA125P, load cell, battery and ESC. The others circuits (current, voltage and speed measures) are of another project and it work well. To test the full circuit i have done a pcb, but the problem is that on the pcb, the circuit don't work well.
In particular, the scales and the voltage measure systems works well, but the others no. I can't arming the ESC, so the motor don't spins and i'm not able to test the other circuits.
Someone can suggest me some solution on how to resolve this problem?
I think that are some problems with the GND, the INA125P and the other components, but i ignore the cause because i'm not an EE, and is very difficult to me to find where i'm wrong.
Here, there is the circuit that i have done