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PIC18LF2550 Wireless Servo Controller

PIC18LF2550 Wireless Servo Controller

It can be used for remote monitoring, as a webcam, or for color/object tracking. The basis for a pan-tilt configuration is the PIC18LF2550 Wireless Servo Controller, which allows to control two servos remotely with very little latency.
The power supply uses a 9 volt battery and a TC1264-3.0V high-accuracy low-dropout linear voltage regulator to provide a stable 3 volt supply for the microcontroller and the transceiver. An additional TC1264-5.0V high-accuracy low-dropout linear voltage regulator is used to provide a stable 5 volt supply for the servos. 1uF (microFarad) polarized decoupling capacitors are necessary on the outputs of the voltage regulators to prevent spikes or ripples. A wall wart power supply as low as 5.3V can be substituted for the 9 Volt battery.

Receiver Microcontroller

The microcontroller used was a Microchip PIC18LF2550. I modified the PIC18F2550 Tiny PIC Bootloader assembly file so I could use a 10MHz crystal/resonator at 57,600 baud (the modified bootloader can be found at the bottom of the page). The PIC18LF2550 runs at a maximum speed of 16MHz (4 MIPs) with a 3 Volt power supply; however, I had 10MHz and 20MHz ceramic resonators on-hand, so I ran at the fastest ‘safe’ speed possible (I could overclock the PIC by running it at 20MHz with a 3 volt supply, but it would be running out of spec. so it may not operate reliably). The firmware was written in C (using CCS PICC) and can be found at the bottom of the page, in addition to a generic RF-24G driver for Laipac TRW-24G 2.4GHz transceivers. R1 is a pull-up resistor necessary for operation. C1 is a stabilizing capacitor that is used for the onboard USB voltage regulator (which is not utilized in this project). The component marked ‘RES’ is a 10MHz resonator. The LED connected to pin C4 is used to indicate data reception and can be omitted if necessary (although it is helpful for debuging).

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