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Construction of the Mk1 Receiver

Construction of the Mk1 Receiver

The remote control receiver is a custom design based on a pre-built 433MHz UHF radio receiver, a decoder chip and a BASIC Stamp.The receiver requires 8.5mA, plus 1.5mA for each LED (individual or segment) that is lit for a maximum of up to 23mA. In practice it is between 13 and 16mA. Pressing a button on the remote transmitter causes the receiver to consume an extra 0.2mA. In the power saving mode the PBASIC nap instruction is used in combination with turning all the LEDs off to reduce power consumption to 4mA. The battery should last about 30 hours of on-time
The circuit is very simple. The pre-built UHF receiver module outputs a bit stream to the decoder chip. The decoder chip looks for repeats of valid sequences. When it decides a valid data transmission has been received, it sets pin 17 (valid data) high and the data appears on pins 10-13.

The Stamp monitors the valid data bit from the decoder. As soon as it becomes high (1), the Stamp knows that a remote button has been pressed.

The SM5035RF-M4 decoder and matching SM5023RF encoder support an eight-bit trinary encoding to distinguish different sets of receivers and transmitters. Each of the eight pins may be left floating, connected to ground, or connected to +5v for a total of 38 = 6561 codes. Leave all the pins floating until you have confirmed it working, then connect one or more pins to ground or +5v, making sure the transmitter and receiver are configured identically


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