Vermes
Advanced Member level 4
Original remote control is based on a chip PT2260 (in version R4) - here is the link to documentation: LINK. The system has twelve 3-state pins for addressing devices, so you can generate 3^12=531441 codes.
This construction is based on microcontroller Attiny13 and radio module RT4 from Telecontrolli. Control software was written in BASCOM and takes 86% of FLASH memory and 61% of EEPROM, in which there are information about the address and commands of each socket, so that in case of a radio conflict there is a quick way to „reprogram” the system to adapt to new conditions.
The board was designed in Eagle and its size was adapted to the housing KM22. Simple front panel was designed in Corel, then printed on self-adhesive paper and laminated.
Operation:
The processor is in Powerdown mode by default and waits for the low state coming from one of three buttons. After waking up, in the main loop the device checks which button was used. On the basis of the time of pressing the buttons, two commands are sent. Short pressing (t<1s) causes sending TURN ON command, while long pressing (t>=1s) – TURN OFF command. The processor turns on the power supply on Telecontrolli system (LED also turns on), sends data, and then turns off the Telecontrolli system and goes into Powerdown mode. The frame sending takes place 5 times because the first frame does not always reach the system.
During work, the system consumes about 4-5mA (t<100ms) from CR2032 battery, while during sleep it is only 0,4uA, so the battery should be sufficient for a long time.
The range due to the power supply is about 10 meters, what is enough in a room.
Scheme:
Pictures:
Video of operation:
Link to original thread (useful attachment) – Emulator PT2260 na Attiny13 - pilot radiowy 433MHz