Hello all,

I`m currently doing a home project that involves Atmega16A microcontroller and a brushed DC motor. The aim is to drive the motor at different speeds using PWM.

I did all of the PWM code on the microcontroller and tested it with a plugged in motor. Works fine (turns from slow to fast as the duty cycle increases).

The catch is that when i change the brushed DC motor to another DC motor it doesnt turn at all.

The datasheet of the motor which is turning is : http://www.johnsonelectric.com/en/p...e-dc-motors/datasheets/PC200DG-020-metric.pdf

The datasheet of the motor which isnt turning is:
http://www.pololu.com/file/download/fa_130ra.pdf?file_id=0J11 (The FA-130RA-18100 one)

 

Hello all,

I`m currently doing a home project that involves Atmega16A microcontroller and a brushed DC motor. The aim is to drive the motor at different speeds using PWM.

I did all of the PWM code on the microcontroller and tested it with a plugged in motor. Works fine (turns from slow to fast as the duty cycle increases).

The catch is that when i change the brushed DC motor to another DC motor it doesnt turn at all.

The datasheet of the motor which is turning is : http://www.johnsonelectric.com/en/p...e-dc-motors/datasheets/PC200DG-020-metric.pdf

The datasheet of the motor which isnt turning is:
http://www.pololu.com/file/download/fa_130ra.pdf?file_id=0J11 (The FA-130RA-18100 one)

What are you using to drive the motor? Do you have a motor driver(transistor, H-bridge, power op-amp)? Your first motor draws 250mA at stall, the second draws 2.2A at stall; can your driver handle that current?

 

I am using an h-bridge based on L298N chip

 

Just a thought: maybe I should feed the driver throught a separate source, lets say a battery connected over the voltage regulator? Because now the driver is fed from the microcontrollers vcc.

 

Just a thought: maybe I should feed the driver throught a separate source, lets say a battery connected over the voltage regulator? Because now the driver is fed from the microcontrollers vcc.

That's a good idea, also, put some capacitors near your microcontroller's Vdd and Vss pins... it's possible that the voltage dip is causing a reset on the uC...