Hi, I’m a student. I ordered 2 set of 3-wire Load Sensor - 50kg (SEN-10245) and SparkFun Qwiic Scale - NAU7802 (SEN-15242).
At first time I used Mbed, but it doesn’t work. Then I carefully read the datasheet and learn from the example again
to confirm how to control and power up it. But it still doesn’t work. So, I decide to comeback to the beginning.
By borrowed the Arduino UNO from my friend, because the example code is compatible to Arduino. It should be easy but it isn’t.
I connected SDA to A4, SCL to A5, 3.3 and GND from UNO to ADC NAU7802. Then connect 1 load sensor to ADC.
I connected RED, BLACK, WHITE from sensor to RED, BLACK, WHITE on ADC respectively. Then run the example code.
Ex1. BasicReadings: I got negative value about -900 or -1200
the reading value doesn’t change when I press the sensor
Ex3. BasicReadings: same result (of course lol)
And after i read these: "This device is optimized to accept differential input signals, but can also measure single-ended signals.
When measuring single-ended signals with respect to ground, connect the negative input (VIN1N or VIN2N) to ground
and connect the input signal to the positive input (VIN1P or VIN2P). Note that when this device is configured this way,
only half of the converter full-scale range is used, since only positive digital output codes are produced."
-I tried to jump GRN or WHT of ADC to GND then I got reading value about -8388607.
I spent many days to solve it but still cann’t. Has anyone has any advice? Please feel free to teach me.
Thanks in advance ,
P.S. In my experiment, I would like to use 6 load sensor to measure the force at each point separately. but at fist, I would like to test with only 1 load sensor.