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