Son of Transceiver range 220718

Wireless & IoT Other Radios
1

Hello SparkFun Forum,

Earlier this month a forum post was made ‘TRANSCEIVER TO 200 300 METERS 220706’ attempting to find a method of increasing the range of the 433 mhz transceiver system currently in use. Jremington provided an excellent reply focused on upgrading the antenna to a bipole antenna.

The device called KM (Kite Messenger)

https://www.allenpitts.com/electronics/ … mple_b.jpg

unfortunately is not receptive to a bipole antenna setup. The tube marked Frame Body is epoxy tubing with an inside diameter of a little less than 7mm or about 1 quarter of an inch.

So, have been researching alternative methods of increasing the range, particularly increasing the range of the transmitter/receiver.

Considering a purchase of two(2) Arduino Pro Mini 328 - 3.3V/8MHz

https://www.sparkfun.com/products/11114

with two(2)

RFM69HCW Wireless Transceiver - 915MHz

https://www.sparkfun.com/products/13909

The 5V of the Pro Mini was considered but reading the datasheet on the RFM69HCW

indicate the max voltage for transceiver is 3.8 V so probably need to base

the system on the lower voltage.

I am pretty sensitive to cost because the plan is to produce the system for sale.

Given that the transmission only goes one way, from the ground up to the KM, what

is the best radio to receiver pair? It is known that SPI is needed to use the

the Servo library and code like

if (triggerValue == HIGH && onState == 0)
  {
    digitalWrite(greenLed, HIGH);//Green Led ON 
    digitalWrite(redLed, LOW);//Red Led OFF 
    for (pos = 0; pos <= 44; pos += 1) { // goes from 0 degrees to 44 degrees
      // in steps of 1 degree
      servoMotor.write(pos);
      delay(15);
    }
    onState = 1;
    offState = 0;
  }

and again the voltage is based on using a 3.7V LiPo battery.

It is thought that the

RFM69HCW Wireless Transceiver - 915MHz

https://www.sparkfun.com/products/13909

is the way to go on the transceiver because of its size and cost.

But there are so many microcontrollers that are Arduino compatible

it is not sure that the Pro Mini is the right choice.

Thanks.

Allen Pitts

Dallas Texas