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Additional resources for Circuit Cellar (May 2002)
5 V to 17 VDC. The Handyboard For this project, I needed a small unique address to each. It measures H-Bridge driver kit is fully assembled, microcontroller such as an AVR, PIC, 113 mm × 52 mm × 30 mm.  tested, and available for $38. or Stamp to drive the H-Bridge to Electronic speed controllers can be Specifications of the MIT Handyboard provide the necessary PWM control found in RC electric model airplane system are located on the Web and signals to the H-Bridge and provide magazines and they usually run contain a PCB pattern and component serial communications to the between $50 and $200, depending on placement diagram for a dual H-Bridge make, size, and model.
Screw any PC standoffs to the prototype board and glue or solder the RS-232 connector directly to the PC board. Now it is time to check the circuit for shorts or open lines. Use your digital voltmeter to check continuity on all power, ground, and logic signals to ensure that they follow the Figure 2 schematic. Before populating the joystick controller board and the optional SERVO84 board with the ICs, power the board by connecting a 9-V battery to the positive and negative power terminals of the 5-V power supply, and check to see if the power LED lights up.
Check power to any other optional modules including the 5 and 6 V for the SERVO84 board. CIRCUIT CELLAR® Issue 142 May 2002 37 the RC servo connectors. Make sure that the connectors are keyed with the ground or positive voltage connections so power is not connected with the wrong polarity. Doing this will surely destroy an RC servo as I found out. Mechanical movements that handle repetitive motor actions (such as a tilt/pan platform) should be connected using stranded wire. If possible, these wires should be coiled to avoid breaking them.