Components
Description
Start/Stop Chronometer
Me and my friend are always in competition for something, in every sports, from ski to run, to MTB. I decided to build this Chronometer to have a precise measurement of the time spent to complete a pre-made circuit. You just have to choose a start and an end point, and place the two module (we 3D-printed a case for it because we soldered everything on a circuit board, you can also do this if you want something definitve) to start the competition.
Credits for the wiring label to: https://arduino-info.wikispaces.com/Nrf24L01-2.4GHz-HowTo
Code
Code for the Start/RX
C/C++
LiquidCrystal lcd(12, 11, 5, 4, 3, 10); int trigPin = 6; int echoPin = 7; int greenLed = 38; int redLed = 39; int m; int s; int dc; const byte thisSlaveAddress[5] = {'R','x','A','A','A'}; RF24 radio(CE_PIN, CSN_PIN); char dataReceived[10]; bool newData = false; void setup() { lcd.begin(16, 2); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); pinMode(redLed, OUTPUT); pinMode(greenLed, OUTPUT); digitalWrite(greenLed, LOW); pinMode(53, OUTPUT); Serial.begin(9600); Serial.println("SimpleRx Starting"); radio.begin(); radio.setDataRate( RF24_250KBPS ); radio.openReadingPipe(1, thisSlaveAddress); radio.startListening(); } void loop() { int duration; int distance; digitalWrite(redLed, HIGH); digitalWrite(trigPin, HIGH); delay(1); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance = (duration/2) / 29.1; if (distance <= 100 && distance >= 0) { digitalWrite(greenLed, HIGH); while (digitalRead(greenLed) == HIGH) { tempo(); getData(); showData(); } } } void tempo() { lcd.setCursor(0,1); dc = dc + 1; lcd.print(m); lcd.print(":"); lcd.print(s); lcd.print("."); lcd.print(dc); delay(100); if (dc == 9) { dc = 0; s = s + 1; } if (s == 60) { s = 0; m = m + 1; } } void getData() { if ( radio.available() ) { radio.read( &dataReceived, sizeof(dataReceived) ); newData = true; } } void showData() { if (newData == true) { Serial.print("Data received "); Serial.println(dataReceived); digitalWrite(ledVerde, LOW); newData = false; } }
Code for the Stop/TX
C/C++
int trigPin = 3; int echoPin = 4; int ledVerde = 5; char dataToSend[10] = "Message 0"; char txNum = '0'; RF24 radio(CE_PIN, CSN_PIN); const byte slaveAddress[5] = {'R','x','A','A','A'}; void setup() { Serial.begin(9600); Serial.println("SimpleTx Starting"); pinMode(trigPin, OUTPUT); pinMode(echoPin, INPUT); pinMode(greenLed, OUTPUT); digitalWrite(greenLed, LOW); radio.begin(); radio.setDataRate( RF24_250KBPS ); radio.setRetries(3,5); // delay, count radio.openWritingPipe(slaveAddress); } void loop() { int duration; int distance; digitalWrite(greenLed, LOW); digitalWrite(trigPin, HIGH); delay(1); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance = (duration/2) / 29.1; if (distance <= 100 && distance >= 0) { digitalWrite(greenLed, HIGH); while (digitalRead (greenLed == HIGH)) { send(); } } } void send() { bool rslt; rslt = radio.write( &dataToSend, sizeof(dataToSend) ); // Always use sizeof() as it gives the size as the number of bytes. // For example if dataToSend was an int sizeof() would correctly return 2 Serial.print("Data Sent "); Serial.print(dataToSend); if (rslt) { Serial.println(" Acknowledge received"); updateMessage(); } else { Serial.println(" Tx failed"); } } void updateMessage() { // so you can see that new data is being sent txNum += 1; if (txNum > '9') { txNum = '0'; } dataToSend[8] = txNum; }
Schematic and Layout
Start/RX
cattura_UE7bhNgToN.PNG
Stop/TX
cattura1_epYYO0s3x0.PNG
Jun 17,2022
593 views
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Start/Stop Chronometer
That's a two-module chronometer for your MTB (or any others sports) to measure your time in a determined circuit!
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Published: Jun 17,2022
PCBWay Donate 10% cost To Author
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