Forum >Gravity Lightning Sensor SEN0290
Gravity Lightning Sensor SEN0290
Account cancelled 2021-05-24 12:08:25 803 Views2 Replies Hi! - I recently purchased 2 of the lightning sensors and am unable to get them to work. I can compile and upload the sketch but immediately get the message:
14:57:46.956 -> DFRobot AS3935 lightning sensor begin!
14:57:46.956 -> I2C init fail
I have everything cabled as described here:
https://wiki.dfrobot.com/Gravity:%20Lig ... %20SEN0290
I have tried multiple Unos as well as a Mega with the same result, as well as trying both SEN0290s. An I2C scanner sketch reports no I2C devices.
Any thoughts????
Thanks,
Scott
14:57:46.956 -> DFRobot AS3935 lightning sensor begin!
14:57:46.956 -> I2C init fail
I have everything cabled as described here:
https://wiki.dfrobot.com/Gravity:%20Lig ... %20SEN0290
I have tried multiple Unos as well as a Mega with the same result, as well as trying both SEN0290s. An I2C scanner sketch reports no I2C devices.
Any thoughts????
Thanks,
Scott
2023-01-27 18:32:05 Robert.Walls
For some reason the designer has omitted a pullup resistor on the SDA line. You can see on the circuit that SCL has a pullup but nothing on the SDA line. Try adding a 10k resistor from SDA to 3.3v (or 5v if that's what you are using) and it should start working like mine did. A good test to check it's running is to put it into Tuning mode (Detailed example) and monitor the frequency on the interrupt pin with an Oscilloscope or frequency counter. Now just waiting for a storm…..
Rob.
Robert.Walls 