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ESP8266 direct serial connection with Teensy 3.5 DMJX 2020
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| #include <Arduino.h> | |
| //**** Using a Teensy 3.5 to Connect an ESP8266 to USB Serial for use and testing with AT commands ******* | |
| #define SSID "insert_SSID" //name of wireless access point to connect to | |
| #define PASS "insert_PASSWORD" //wifi password | |
| #define RST_PIN 24 // Pull low to trigger reset | |
| #define CH_PD_PIN 25 // Pull high for AT command mode, low for firmware flash mode | |
| #define TX_LED_PIN 14 // YELLOW LED - SENDING | |
| #define RX_LED_PIN 15 // RED LED - RECEIVING | |
| long lastTxTimestamp=0; | |
| long lastRxTimestamp=0; | |
| void resetESP() { | |
| digitalWrite(RST_PIN,LOW); | |
| digitalWrite(TX_LED_PIN,HIGH); | |
| delay(100); | |
| digitalWrite(RST_PIN,HIGH); | |
| digitalWrite(TX_LED_PIN,LOW); | |
| } | |
| void setup() { | |
| delay(5000); //allow time for usb to enumerate - can remove this later | |
| pinMode(CH_PD_PIN, OUTPUT); | |
| digitalWrite(CH_PD_PIN, HIGH); | |
| pinMode(TX_LED_PIN, OUTPUT); | |
| pinMode(RX_LED_PIN, OUTPUT); | |
| pinMode(RST_PIN, OUTPUT); | |
| resetESP(); | |
| // Setup computer to Teensy serial | |
| Serial.begin(115200); | |
| // Setup Teensy to ESP8266 serial | |
| // Use baud rate 115200 during firmware update | |
| Serial1.begin(115200); | |
| Serial.println("ESP Demo"); | |
| delay(2000); | |
| } | |
| void loop() { | |
| // DIRECT CONTROL | |
| // Send bytes from ESP8266 -> Teensy to Computer | |
| if ( Serial1.available() ) { | |
| digitalWriteFast(TX_LED_PIN, HIGH); // set the LED on | |
| lastTxTimestamp = millis(); | |
| char ch = Serial1.read(); | |
| Serial.write(ch); | |
| } | |
| // Send bytes from Computer -> Teensy back to ESP8266 | |
| if ( Serial.available() ) { | |
| digitalWriteFast(RX_LED_PIN, HIGH); // set the LED on | |
| lastRxTimestamp = millis(); | |
| char ch = Serial.read(); | |
| Serial1.write(ch); | |
| } | |
| if (millis() - lastTxTimestamp > 5) { | |
| digitalWriteFast(TX_LED_PIN, LOW); // set the LED off | |
| } | |
| if (millis() - lastRxTimestamp > 5) { | |
| digitalWriteFast(RX_LED_PIN, LOW); // set the LED off | |
| } | |
| } |
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