Thanks for the reply Charles. This E.speed control will be connected to a
radio control receiver. So, I am assuming that I will have to go through the
digitally.
As the receiver gets the signal to vary the speed, the motor should
correspond directly. Either speed up or slow down. I understand I can just buy
it for a 20 buck of the hobby stores, but I guess I just want to go though the
hassle of how it actually works.
What actually happens when the the PIC receives a signal through the RX?
----- Original Message ----- From: "Charles Linquist" Date: Thu, 6 May 2004 11:26:13 -0700 To: Subject: Re:
[piclist] Electronics speed control
I use speed control for fan motors all the
time.
You have two choices:
1: Analog - convert PIC PWM to dc voltage
with RC network. Use op-amps and P-channel FET to convert
0-5V level to 0-12V level
(or whatever your motor requires). Simple, easy to understand, but wastes
a lot
of power as heat.
Useful only for small motors.
2: Pure digital - Use PWM output directly
to drive FET driver (and power P-channel FET). Filter the output with
an L-C network.
Can handle larger motors. Very efficient.
I have used both methods, and control the
"high side" rather than than the "low side" so that the motor
tachometer
can be ground-referenced.
You have to pick which one works best for you,
but I can give examples of either.
Charles Linquist
----- Original Message -----
From: randy ram
To: p...@yahoogroups.com
Sent: Thursday, May 06, 2004 8:04 AM
Subject: [piclist] Electronics speed control
Has anyone worked on a speed control before. I want to drive a small dc
motor. The same as the radio control electric motors.
I currently use PicBasic Pro.
Thanks
----- Original Message ----- From: cdb Date: Sat, 1 Nov
2003 13:57:03 +1000 To: Subject: Re: [piclist] share any
schematics or projects using a Pic 16C765?
This months Elektor
magazine has a 2 channel ADC to USB circuit.
The code can be
downloaded from their website www.elektor-electronics.co.uk free
downloads and then this months issue.
Colin -- cdb,
b...@optusnet.com.au on 01.11.2003
I have always been a few Dendrites
short of an Axon and believe me it shows.
Light travels faster than
sound. That's why some people appear bright until they speak!
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