RADIO CONTROL - 4 Channel

INSTRUCTION SHEET

 

 

 

 

 

Price - Stock No 600 - Transmitter 433 Mhz 4 Channel

Price - Stock No 601 - Receiver 433 Mhz 4 Channel

Specifications

Feature

Value

Units

Radio Frequency

433

MHz

Range

100

m

Channels

4

 

Voltage

Receiver 6 V

Transmitter 3 V

Volts

Transmitter Current Draw

min 6.5

max 9

mA

Receiver Current Draw

min 2.5

max 40 - All four relay's activated

mA

Address Posibilities

 6561

 

Transmission Frequency

7.13

Hz

433 MHz Transmitter

How it Works - Transmitter

The radio control uses pre-calibrated 433 MHz transmitter and receiver modules.  The SM 5162 presents a code to the transmitter module depending on the status of the input switches.  The 555 is configured to provide a regular pulse to the 'transmit enable' (pin 15) of the SM 5162 - this pulse runs at a frequency of about 7 Hz (the LED will flash with each transmission).  This means that the transmitter will update the code transmitted 7 times a second.  See 555 Timer Astable Multivibrator

 

The SM 5162 also features 'address pins'.  These pins (pins 1 .. 8) can be either connected to +3V, 0 V or left unconnected.  Both the transmitter and receiver kits must be address the same for correct operation.  This feature, along with the 7 Hz transmission frequency allows more than one remote control system to operate in close proximity.  

433 MHz Radio Receiver

 

How it Works - Receiver

The code transmitted by the transmitter kit is received by the 433 MHz receiver module and provided to the SM 5172 'data in' pin (pin 17).  Provided a matching address is received, the input switch positions are displayed on LED 1 .. 4  In addition miniture relays are activated to interface with your radio controlled robot / car / system.

The 'valid transmission' pin (pin 14) is sent to the fifth LED which will flash with each valid transmission.  In most conditions this will occur in syncronicity with the transmitter.

Construction Overview

Transmitter

  1. NOTE: keep all excess component legs trimmed off after soldering.  These will be used later with the addressing connections.
  2. Identify and position the resistors - solder in place - refer Soldering Technique 
  3. Position the two IC sockets and solder.
  4. Identify the two capacitors and position them being careful to observe the polarity of the 1 uF electrolytic.
  5. Insert the PCB pins and solder.
  6. The LED's can now be inserted and soldered.  Take care with polarity.
  7. The antenna is a piece of tinned copper wire, cut to 172 mm and straightened.  It can be soldered in place.
  8. Care should be taken with the 433 MHz transmitter module and should be handled as little as possible.  It can now be inserted  - taking care to identify and locate the antenna (ANT) leg of the module.  Solder in place.
  9. The battery holder can now be connected by soldering.
  10. Care should be taken when handling the IC's.  Orientate the 555 and SM 5162 with the notch as shown in the above diagram.  Carefully insert the two IC's.
  11. Addressing the transmitter and receiver circuits is covered below.

Construction Overview

Receiver 

  1. NOTE: keep all excess component legs trimmed off after soldering.  These will be used later with the addressing connections.
  2. Identify and position the resistors - solder in place - refer Soldering Technique 
  3. Position the IC socket and solder.
  4. Insert the PCB pins and solder.
  5. The four relays can be located and soldered.
  6. The LED's can now be inserted and soldered.  Take care with polarity.
  7. The antenna is a piece of tinned copper wire, cut to 172 mm and straightened.  It can be soldered in place.
  8. Care should be taken with the 433 MHz receiver module and should be handled as little as possible.  It can now be inserted  - taking care to identify and locate the antenna (ANT) leg of the module.  Solder in place.
  9. The battery holder can now be connected by soldering.
  10. Care should be taken when handling the IC.  Orientate SM 5172 with the notch as shown in the above diagram.  Carefully insert it.
  11. Addressing the transmitter and receiver circuits is covered below.

 

ADDRESSING THE CIRCUITS

For correct operation, the transmitter and receiver circuits must be address the same.  The address pins can be connected to either +V, 0 V or left unconnected.  The excess component legs are used to make links for this purpose.  The address can be chosen at your discresion.

It is suggested that at least one connection be made on any of the address lines as the zero address (no connections) is susceptable to interfearance from other 433 MHz transmission devices in your proximity.  To further minimise interfearance, it is suggested that the receiver module be addressed and turned on.  If after some time no data appears on the LED indicators #1 .. #4 it can be assumed that this address is suitable for your use.  Turn the receiver off and address the transmitter the same as the receiver.

Any additional radio control sets should be addressed differently so that your receiver only 'listens' to your transmissions and your friends receiver only 'listens' to their transmission. 

Possible addressing connection

 

FIRST USE

Connect the batteries to the transmitter module.  The Transmit Enable LED will flash at about 7 Hz.  Connect the batteries to the receiver module.  With the receiver and transmitter about a meter apart, the Valid Transmission LED on the receiver will flash in sync with the transmitter.

Any combination of buttons pressed on the transmitter module will result in the receiver module illuminating the appropriate LED #1 .. #4 and activating the respective relay.

WHAT'S NEXT

The output of the receiver module is from the four relay's.  These contact rating of 1 amp - enough to power a small motor.  For higher power applications, a second relay(s), switched from the receiver's relay output(s) can be implemented. 

 

MORE INFORMATION

View the Datasheet for the SM 5162

View the Datasheet for the SM 5172 .

View the Datasheet for the 555

 

TROUBLESHOOTING

Ensure addressing is the same on the transmitter and receiver.

Check all soldering connections.

Check polarity of IC's, Transmitter and Receiver Modules, LED's and 1 uF capacitor.

Ensure batteries are charged.

Contact CdS electronics

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