Teensy 3.6 + Radio Control
The Radio Control receiver was the main reason for me to investigate microcontrollers. I needed a way to read the signal that I was transmitting from a Radio Control transmitter. I discovered about PWM signals and that they could be read by microcontrollers. I started small with the Arduino Uno, but have branched out since. Reading a radio control receiver is useful as I can take control of the robot if it is heading into danger.
Video
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Photo
Sketch
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| // Copyright (C) 2019 https://www.roboticboat.uk | |
| // 560077e6-ccb2-4304-9431-97d5b92b1d9e | |
| // | |
| // This program is free software: you can redistribute it and/or modify | |
| // it under the terms of the GNU General Public License as published by | |
| // the Free Software Foundation, either version 3 of the License, or | |
| // (at your option) any later version. | |
| // | |
| // This program is distributed in the hope that it will be useful, | |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| // GNU General Public License for more details. | |
| // | |
| // You should have received a copy of the GNU General Public License | |
| // along with this program. If not, see <https://www.gnu.org/licenses/>. | |
| // These Terms shall be governed and construed in accordance with the laws of | |
| // England and Wales, without regard to its conflict of law provisions. | |
| int ch1; | |
| int ch2; | |
| int ch3; | |
| int ch4; | |
| void setup() | |
| { | |
| // Keep the User informed | |
| Serial.begin(9600); | |
| // Setup radio control input pins | |
| pinMode(35, INPUT); | |
| pinMode(36, INPUT); | |
| pinMode(37, INPUT); | |
| pinMode(38, INPUT); | |
| } | |
| void loop() | |
| { | |
| // Read the pulse width of each channel | |
| ch1 = pulseIn(35, HIGH, 20000); | |
| ch2 = pulseIn(36, HIGH, 20000); | |
| ch3 = pulseIn(37, HIGH, 20000); | |
| ch4 = pulseIn(38, HIGH, 20000); | |
| // Map the value to the range 0 to 180 which is what radio control servos like | |
| ch1 = map(ch1,1000,2000,0,180); | |
| ch2 = map(ch2,1000,2000,0,180); | |
| ch3 = map(ch3,1000,2000,0,180); | |
| ch4 = map(ch4,1000,2000,0,180); | |
| // Print data to Serial Monitor window | |
| Serial.print("$RC,"); | |
| Serial.print(ch1); | |
| Serial.print(","); | |
| Serial.print(ch2); | |
| Serial.print(","); | |
| Serial.print(ch3); | |
| Serial.print(","); | |
| Serial.println(ch4); | |
| } |