WALKING ROBOT Page 10 Circuits for a Walking Robot To search more than 40 BEAM sites, click BEAM ONLINE. In this section we show how to connect a 4 Nv MicroCore circuit
to two motors via a 74HC245 octal buffer chip.
View 2 more pages of the excellent pictures of Chiu-Yuan Fang's Walker Version 2:
The 74HC245 octal buffer (driver) chip has a 50mA capability per output and
two outputs are joined in parallel in the diagram above to get 100mA per line. If you
require more current, the following transistor H-Bridge can be used: The circuit above will provide up to about 500mA drive-current for each motor and this is needed when a motor has to be started under load. As soon as the motor "starts", the current will drop, but it's the ability of the circuit to provide a high starting-current that prevents a "stalled condition." The LEDs provide indicators to show the operation of the circuit. |