Serge NOEL
51 lines
3.7 KiB
Arduino
51 lines
3.7 KiB
Arduino
// Initialize and Scan Sensor Data for Serial Transmission to JMRI Sensor Table
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// Author: Geoff Bunza 2018
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// Version 1.2
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// Transmission starts with a synchronizing character, here the character "A" followed by
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// 1 byte with bit 7 Sensor ON/OFF bit 6-0 sensor # 1-127
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// Transmission is received in JMRI via SerialSensorMux.py Python Script
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// It is assumed that the Arduino sensor mux starts up before the Python Script which will transmit "!!!\n"
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// To indicate the script is running and ready for reception
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// The Arduino will then poll all (up to 70) sensors and transmit thir states for initialization in the JMRI sensor table
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// The serial port assigned to this Arduino must correspond to the Serial Port in the corresponding Sensor Script
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// The Arduino will update JMRI ONLY upon detecting a sensor change minimizing overhead transmission to JMRI
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//
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#define Sensor_Pin_Max 20 // Max sensor pin NUMBER (plus one) Mega=70,UNO,Pro Mini,Nano=20
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#define Sensor_Pin_Start 2 // Starting Sensor Pin number (usually 2 as 0/1 are TX/RX
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#define Sensor_Offset 0 // This Offset will be ADDED to the value of each Sensor_Pin to determine the sensor
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// number sent to JMRI, so pin D12 will set sensor AR:(12+Sensor_Offset) in JMRI
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// This would allow one Arduino Sensor channel to set sensors 2-69 and another to
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// Set sensors 70-137 for example; this offset can also be negative
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#define Sensors_Active_Low 1 // Set Sensors_Active_Low to 1 if sensors are active LOW
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// Set Sensors_Active_Low to 0 if sensors are active HIGH
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#define open_delay 15 // longer delay to get past script initialization
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#define delta_delay 4 // Short delay to allow the script to get all the characters
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int i;
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char sensor_state [70]; // up to 70 sensors on a Mega2560
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char new_sensor_state ; // temp to process the possible state change
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char incomingByte = 0; // working temp for character processing
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void setup(){
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Serial.begin(19200); // Open serial connection.
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while (Serial.available() == 0); // wait until we get a charater from JMRI
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incomingByte=Serial.read(); // get the first character
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while ((Serial.available() > 0) && (incomingByte != '!')) incomingByte=Serial.read(); //get past !!!
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while ((Serial.available() > 0) ) incomingByte=Serial.read(); //flush anything else
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delay(open_delay); // take a breath
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for ( i=Sensor_Pin_Start; i<Sensor_Pin_Max; i++) { //Initialize all sensors in JMRI and grab each sensor
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pinMode(i, INPUT_PULLUP); // define each sensor pin as coming in
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sensor_state[i] = (digitalRead( i ))^Sensors_Active_Low; // read & save each sensor state & invert if necessary
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Serial.print("A"); Serial.print (char((sensor_state[i]<<7)+i)); // send "A <on/off><snesor #>" to JMRI script
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delay(delta_delay); // in milliseconds, take a short breath as not to overwhelm JMRI's seraial read
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}
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}
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void loop() {
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for ( i=Sensor_Pin_Start; i<Sensor_Pin_Max; i++) { // scan every sensor over and over for any sensor changes
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new_sensor_state = (digitalRead( i ))^Sensors_Active_Low; // read & save each sensor state & invert if necessary
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if (new_sensor_state != sensor_state[i] ) { // check if the sensor changed ->if yes update JMRI
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Serial.print("A"); Serial.print (char((new_sensor_state<<7)+i)); // send "A <on/off><snesor #>" to JMRI script
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sensor_state[i] = new_sensor_state ; // save the updated sensor state
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delay(delta_delay); // in milliseconds, take a short breath as not to overwhelm JMRI's seraial read
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}
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}
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}
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