Hello guys, today we are going to setup our 433Mhz transmitter and receiver modules with their supporting cards. We are using cheap 433mhz modules and we are not using any microcontroller with this. The dedicated encoder and decoder IC’s can do the job perfectly.

433MHZ modules:

433Mhz-RF-Transmitter-Receiver-factoryforward.png


Cheapest RF (Radio frequency) modules available in market and these are available easily on eBay, amazon. For 433MHz we need about 17.3 cm antenna for proper communication, The range is up to 100meters. Which make sense to use these modules inside homes as remote-control devices for lights, fans, tv and toys like cars.

The two types of modules are available but the Red colored one is working fine in all the applications, Also this one has a crystal oscillator which communicate directly with receiver. The second(green one) module has a coil and capacitor rasonator circuit, which I will not recommend to use in high end applications.

Wire Diagrams:

433 TX.png


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Components required:

  • HT12D ic
  • HT12E ic
  • RF 433 transmitter and receiver module
  • battery (5v- recomanded)
  • 1Mohm and 47K resistor
  • LED's (different colors)
  • Tactile switches
  • Custom PCB
  • Wires and breadboard

Schematics:

Receiver-

ice_screenshot_20220305-180007.png

Transmitter

Circuit description:

mini_20220304_113116.jpg

Transmitter section- Here in diagram, We are using HT12E is used to encode the data from the button pins and then sent to receiver part by 433mhz module. So, for oscillations we are connecting 1Mohm resistance as mentioned in the datasheet of the IC. Also there is one big DIP switch, which helps to select 8 different channels. Simply meaning that we can run 8(transmitters and receivers) at one place without interference. So that’s a very good and helpful update here. We can attach four tactile buttons or something like PWM signal to the input terminals for the data to get transmit. We have to give an active low signal for triggering.

Specifications of 433MHz RF Transmitter Module: –

  • · Max range with the antenna in normal Conditions: 100 Meters
  • · RX Receiver Frequency: 433 MHz
  • · RX Typical Sensitivity: 105 dB
  • · RX Supply Current: 3.5 mA
  • · RX IF Frequency: 1MHz
  • · RX Operating Voltage: 5V
  • · TX Frequency Range: 433.92 MHz
  • · TX Supply Voltage: 3V ~ 6V
  • · TX Output Power: 4 ~ 12 dB
mini_20220304_115453.jpg


Receiver section- contains an 8-pin big module and here we are using HT12D, decoder IC. The transmitted data is received by module and then decoded by HT12D decoder. Here for oscillations we are using a 47k resistance and both the modules are supplied using 5v. We get the data in the format of active low signal. The amplitude of received data is...

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