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Fig. 1 Picaxe controlling a H-bridge DC motor control.

Connecting the Picaxe to a H-Bridge DC Motor Control

by Lewis Loflin

In this simple demonstration we use the two pulse-width modulators on the Picaxe 18M2 with a H-bridge controlling both direction and speed at the same time as shown in the video.

Connect two switches as shown above to pins C.5 and B.0. When both switches are pressed at once, it goes into programmed mode.

The above is connected to pin B.1 while the connections for the H-bridge is the same as the Arduino links below.

• Build a H-Bridge Motor Control with Power MOSFETS
• Using the ATMEGA168/Arduino with the TA8050 Motor Controller

init: 
pwmout pwmdiv4, B.6, 50, 500
pwmout pwmdiv4, B.3, 50, 500

main:
if pinC.5 =0 AND pinB.0 = 0 then auto1
if pinC.1 =0 then auto1
if pinC.5 =0 then fwd ;connected to switch with pullup
if pinB.0 = 0 then rev1 ;connected to switch with pullup

b0 = 0
pwmduty B.3,b0; set pwm duty
pwmduty B.6,b0; set pwm duty
goto main

rev1:

readadc B.1, b0  ;read ADC into variable b0
pwmduty B.6,b0; set pwm duty
goto main; loop back to start


fwd:

readadc B.1, b0  ;read ADC into variable b0
pwmduty B.3, b0; set pwm duty
goto main; loop back to start

auto1:
b0 = 0
pwmduty B.3, b0; set pwm duty
pwmduty B.6, b0; set pwm duty
pause 3000

pwmduty B.6, 75; set pwm duty
pause 1000
pwmduty B.6, 0
pause 1000
pwmduty B.3, 75; set pwm duty
pause 1000
pwmduty B.3, 0

pause 1000

pwmduty B.6, 150; set pwm duty
pause 1000
pwmduty B.6, 0
pause 1000
pwmduty B.3, 150; set pwm duty
pause 1000
pwmduty B.3, 0

pause 1000

pwmduty B.6, 200; set pwm duty
pause 1000
pwmduty B.6, 0
pause 1000
pwmduty B.3, 200; set pwm duty
pause 1000
pwmduty B.3, 0

goto main

Other Main Sections of this Website

• L298N Motor Controller Theory and Projects
• Connecting the Arduino to a L298N H-Bridge
• ATMEGA168 Arduino Micro-Controller Projects
• ATMEGA168/Arduino Power Inverter Power Circuits
• Simple 12-14 Volt DC to 120 Volt AC Inverter
• H-Bridge Motor Control with Power MOSFETS Updated

General Electronics

• Build a Thermocouple Amplifier
• Build a Potato battery
• Testing a Diac
• Basic Triacs and SCRs
• Solid State AC Relays with Triacs
• Light Activated Silicon Controlled Rectifier (LASCR)
• Basic Transistor Driver Circuits for Micro-Controllers
• Opto-Isolated Transistor Drivers for Micro-Controllers
• Build a H-Bridge Motor Control with Power MOSFETS
• Series/Parallel batteries
• Using a CdS Photocells
• Voltage Comparator Information And Circuits
• Resistive Humidity Sensors
• Reed Switches
• Diodes and Rectifiers
• Transformers and misc. topics