ERF Radio Transducer

ERF radio transducers are RF transceiver modules which allow PICAXE, computers and other devices to wirelessly communicate with each other.

An ERF radio transducer operates at 868MHz by default, but 315MHz, 433MHz, 900MHz and 915MHz are selectable dependant on region.

For breadboard/stripboard work the ERF module is recommended, as this has 2.54mm spaced pads and also supports both 3V and 5V operation.

To complete a radio link to a computer use the matching URF USB module. A ERF/URF pair of modules also allows 'over-the-air' wireless reprogramming of a PICAXE chip.

Related Commands:

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Schematic

PCB

Transmit via ERF

Transmit via ERF

Code Example:
init:	high B.7
	pause 100
main:	serout B.7, N2400, (“Value =”, #b1,CR,LF)
	let b1 = b1 + 1
	pause 1000
	goto main
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Transmit from one PICAXE to another

This program reads an analogue input on pin C.0 and a temperature sensor connected to pin C.1 and passes them to an ERF for transmission.

Code Example:
init:	high B.7
	pause 100
main:	readadc C.0,b0
	readtemp C.1,b1
	serout B.7, N2400, ($55,$55,b0, b1)
	pause 1000
	goto main
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Receive transmitted data

This program receives data transmitted by a PICAXE via ERF (Example 2) and controls LEDs on output pin B.0 and B.1 depending on the received light level and temperature determined by the transmitter.

Code Example:
main:		serin C.7, N2400, ($55,$55),b0, b1
		debug
test_LDR:	if b0 > 40 then LDR_high
LDR_low:	low B.0
		goto test_temp
LDR_high:	high B.0
test_temp:	if b1 > 20 then temp_high
		temp_low low B.1
		goto main
temp_high:	high B.1
		goto main
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Create Module

An ERF based radio module may be connected to the generic terminal block create module. This module will work at 5V.

Bill of Materials

DescriptionCodeQty
ERF radio module RFA020 1 Buy Now
ERF and URF 'combo' pair of radio modules RFA030 1 Buy Now

Simulation

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