2 Channels RF remote control

  
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How many times you needed some remote control to handle some electric device many times. There are lot of remote controls like infrared, RF, SMS (like my other circuit) and more. The basic small-range remote controls are 2, Infrared and RF (Radio Frequency). One of the weaks of Infrared is that the signal can not pass the walls. So, if you want
2 Channels RF remote control - schematic

to control your garage door, the only way is to use some RF remote control. The circuit (transmitter and receiver) use few components and ordinary (I love few component circuits). Its easy to build it because you don`t have to tune-up any coil or variable capacitor. The RF modules are fix to work in 418MHz area. b. ) and the power-saving of the transmitter. One transmitter must have battery long-life, there is not good to change the battery after 3 days ;). I don`t care about the receiver`s power supply, because receiver must be working all the time. The transmitter is constituted by AT90S2323 microcontroller and TLP434 RF transmitter module at 418MHz. I have designe the transmitter for more battery economy and safe transmition of the data. o The battery economy is made it by the use of powerdown mode of AVR. In this case the AVR goes to sleep with less than 1uA (microampere) current and wait for external interrupt on pin PB1 to awake from sleep and continue operating. If you press the S2 key, the logic of this pin goes to `0` (0V) and AVR awake frome the sleep mode (because PB1 is INT0) and check if pressed the S1 key. If not, the AVR take as pressed key the S2. If yes the AVR take as pressed key the S1. If you press the S1 key the logic of this pin and PB1 (through 1N4148) goes to `0` (0V). In this case the AVR take as pressed key the S1. After, calculate the checksum and transmit 4 times the same 4 byte sequence to make...



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