Cheap Power Module w/Current Sensor
From Banggood
(Weight of this module as-received is ~20.79g, while the module board only is 4.01g.)
Voltage Sensor - Voltage Divider
BEWARE!!! This module voltage sensor does not output 3.3v which can burn out a flight controller if connected directly.
Voltage output of this module:| Input (Battery) Voltage | Module Output Voltage |
| (3S) 12.25 | 6.27 |
| (4S) 16.62 | 8.51 |
A simple voltage divider circuit can be added to the module output to get a 0-3.3v range for use on flight controllers.
Voltage Divider Calculator HERE
The suggested values to use are:
| R1 | R2 | |
| Module (3S) 6.27 | 1k | 1k |
| Module (4S) 8.51 | 3.3k | 2k |
| (3S) 12.6 | 10k | 3.3k |
| (4S) 16.8 | 10k | 2.2k |
Remember to perform voltage sensor calibration on the flight controller.
Current Sensor
The current sensor on this power module seems to be okay for use on 0-3.3v flight controller.| Measured Current | Module Reading | Calibration(amp/volt) |
| 7.82 | 0.400 | 19.550 |
| 8.43 | 0.438 | 19.247 |
| 12.69 | 0.540 | 23.500 |
| 13.45 | 0.590 | 22.797 |
| AVG | 21.273 |
This may be a 75A current sensor?
