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Here is my current sensor. It uses a ACS-756 (100A) and a voltage regulator to supply the 5V directly from the battery. The output is 2.5V @ 0A and since the maximum voltage at the FrSKY receiver analog inputs is 3.3V I'm using it inverted so the output would be 0V @ 100A. I set the offset and range...

Sorry for taking so long... I used this sensor: http://dx.com/p/hall-magnetic-sensor-module-for-arduino-dc-5v-135033. It uses an 3144 sensor probably from Allegro (although Allegro says it's discontinued). I could buy the sensor only but this one comes with a PCB which makes it easier to install. Th...

I did it!

I connected a hall sensor (3144) directly to the FrSky hub. Glued 2 small strong magnets to the main gear of my heli, placed the sensor about 1mm away from the main gear and voilà!

The measurements are consistent with an optical tachometer.

I made a current sensor using an Allegro ACS756 sensor (100A). I'm supplying 5V so the output to 0A is 2.5V. 100A will be 0V or 5V (depending on how you wire the sensor). Since the DHT analog input can read up to 3.3V I wired the sensor to output 0V for 100A. Now I think I'll have to customize my fi...

Hello! I have the same idea. I fly a 450 heli and it's complicated to put an optical sensor in it. So I thought on placing 2 magnets (I already bought them!) on the main gear and attaching the hall sensor to the frame. I removed the shrink tube from the FrSky rpm sensor and It consists basically on ...