Recently we have finished development of certain FSK remote control transmitter, working at either 433MHz or 868MHz with respective max. transmitting power +10dB provided by chip, the remote control product has been in market for months now, and can be considered a success from performance perspective. The remote control transmitter chip we chose is Si4010 …

Recently we have been working on a project to software implentment HCS301 Keeloq encoder on PIC microcontrollers, such as PIC12F629, and the assembly code of transmitter shell is listed as follows. This code mainly includes the following parts, EEPROM counter increase, Keeloq encryption and PWM transmitting as per HCS301 format. Other encryption related details can …