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Four channels RF wireless transmitter and receiver

 For additional information and resources check the Links below...

Figure 1. RF 4 channels remote Transmitter

 This is a very simple Wireless RF transmitter circuit that consists of the Holtek HT-12E encoder chip and AM 418MHZ-transmitter module (WZ-X01, other similar device can be used). Using the hybrid RF xmit/receive modules make building the RF remote control a lot easy.

The wireless transmitter can be powered with any voltage from +3 to +12V. The total current consumption is less than 5ma. Depending on the supply voltage, you may need to select a difference resistance value for the oscillator resistor R1. The recommended oscillator is Foscd (decoder) = 50 Fosce (encoder). See data sheet for more details.

The individual security code of the transmitter is preset by dip-switches S5, up to 256 combinations.

When any of S1-S4 is pressed the /TE pin is pulled low, and power is applied to both the encoder chip and wireless transmitter module, the encoder then starts scanning and transmitting the status of the 12bits address and data serially.



Figure 2 RF 4 channels receiver circuit


The circuit diagram for the wireless receiver (WZ-R01 or other similar device can be used) is shown in figure 2. The decoder U1(HT-12D) receives serial addresses and data from the encoder that are transmitted by the RF wireless transmitter module. It compares the serial input data three times continuously with its local addresses. If no error or unmatched codes are found, the input data codes are then decoded and transferred to the output pins D8~D11. The VT pin also goes high to indicate a valid transmission, which will turn on the LED1. The addresses of the decoder (set by S1) have to be matched with the transmitter encoder. The outputs of U1 drive the four TIP30 PNP transistors that can be connected to the relays or lamps.

The operating range of this wireless transmitter/receiver is dependent on the choice and position of the antenna. The space around the antenna is as important as the antenna itself. Try to keep the antenna away from other metal in the system such as batteries and PCB ground plane. The following types of antenna are recommended.

Antenna Configuration

the transmitter kit for only $20

Kit includes(no pcb):
1 Ming RF Transmitter module, WZ-X01, or WZ_T434
1 Holtek HT-12E Encoder IC
8 1N4148 Diodes
4 Push button Switches
1 Dip switch
1 Resistor (680K)

the Receiver kit for only $24

Kit includes (no pcb):
1 Ming RF Receiver module, WZ-R01, or WZ-R434
1 Holtek HT-12D Decoder IC
4 1N4001 Diodes

4 TIP30 PNP transistors
1 2N3904 NPN transistor
1 Dip switch
3 Resistors (30K, 330, and 1K)

 For additional information and resources check the Links below...

If you need help or have any comments on this project, please email us at order@wzmicro.com

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