CCS PCM compiler pic16f876 microcontroller circuit prepared with software installed on the PIC hex output FETs are driven IRL1004 MOSFET PWM frequency of 10 kHz with the engine. Prepared with eagle pcb circuit and printed circuit board file source software.
I tried several ready made PWM speed control circuits. Of the few I tried, there were problems that I did not like.
1) Lots of components.
2) PWM running as a low frequency which became audible as a loud buzzing sound from the motor.
3) I needed to build it now, and did not have all the components.
My solution, although it’s much like cracking nuts with a sledge hammer, solved these problems.
The PWM frequency is about 10 kHz and does not make a noise in the motor.
The 5 K Ohm potentiometer is connected to ADC input channel 0 and is converted to
1024 (10 bit) value, this value is applied to the PWM control and produces very smooth speed control.
The HEXFET type IRL1004 has extremely low on resistance (0.009 Ohm) and requires only logic level drive, in this
application it does not get warm even when controlling 1 Amp motor current. according the IRL1004 data sheet it
can handle much higher motor current.
It is important to have a moderately fast diode across the motor supply, as close to the motor as possible.
Possible future changes:-
Add RS-232 for software control which could be used for other projects.
Allow the motor to rotate in either direction by adding an H-Bridge output stage.
Control more than one motor using the same microcontroller.
Use a smaller microcontroller.
HEX file for PIC16F876 (overkill) will be made available at the end of the month.
Add tachometer for precise speed control.
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PIC16F876 PWM Motor Speed Control ccs c Alternative link:
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Published: 2008/03/02 Tags: ccs c examples, microchip projects, microcontroller projects, motor control circuit, motor driver circuit, pic16f876 projects, pwm circuits
DC to DC Converter circuit TL494 12V to 30V Adjustable
Good NiCd batteries are 2000 mAh and can be supplied with 5 A charging current in less than 1 / 2 hour load. On the green lawn flight is often the only car battery power source.For flight NiCd batteries with up to 7 cells (7 x 1.5 V, V = 10.5) is also good. With a higher number of cells is sufficient then the car battery voltage is not more. A Transverter, the car battery voltage to a higher stress level. A 20-cell battery for example, requires 30 V. TL494 SWITCHMODE Pulse Width Modulation Control Circuit
DC to DC Converter circuit diagram;
PWM-Motordrehzahlregelung PIC16F876
CCS PCM-Compiler pic16f876 Mikrocontrollerschaltung, die mit auf den PIC-Hex-Ausgangs-FETs installierter Software vorbereitet ist, wird mit der Motor-IRL1004-MOSFET-PWM-Frequenz von 10 kHz angesteuert. Vorbereitet mit Eagle Leiterplatten- und Leiterplattendateiquellensoftware.
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