Hi, Im Rohan and im experimenting with building a mini quad from scratch.
Ive built a 450 size quad before using brushless motors and a CC3D FC and its been performing well but honestly there was no build satisfaction as it just involved assembly of all components.
So this project where i want to build everything from scratch.
This mini quad has 716 coreless motors, a Motor driver board using A2SHB si2302 N-channel Mosfets, 10k Resistors and 1N4007 Diodes.
The Motor driver circuit Description..
(Please see attached Image file)
Gate is connected to PWM signal output ( Turnigy receiver)
Source is connected to ground
10k resistor between gate and ground ( between the gate and source pins on si2302)
Drain is connected to motor(-ve) with Diode in parallel
The PWM signal is provided by the Turnigy 5ch Tx-Rx. The arduino Mpu6050 interface is omitted as i want to test the motor driver circuit.
There are some issues with the build as shown in the video.
As soon as i turn on the transmitter, all the motors start to spin slowly. If i toggle any joysticks to change the pwm signals to any motors, that respective motor spins just a little faster or slower but the motors dont generate any thrust.
However if i bypass the Mosfet and connect a jumper between the Drain and Source, the motor spin velocity is high enough to lift that arm of the quad of the ground.
I have my doubts on the following..
1. The choice of Mosfet. Im beginning to wonder if si2302ds is good enough but 90% of all reference i look up have used this mosfet.
2. The 10k resistor, is it overkill?
Can someone please help with a solution. Would be obliged..
Well maybe 4 years ago, but these days flight controllers are very, very sophisticated as is the software that runs them. A product of hundreds of folks and man hours with input from some of the best, most experienced pilots out there.