README.md

@@ -1,28 +1,15 @@
 # Han Mqtt Adapter
-
-### Install
-1. Setup picoW with MicroPython [link](https://www.raspberrypi.com/documentation/microcontrollers/micropython.html)
-2. Add dependencies (umqtt)
-3. Copy main.py and config.py to picoW root
-4. Edit config.py to correct SSID, Password and MQTT broker IP
-
-### Protocol
-[link to HAN protocol](https://hanporten.se/svenska/protokollet/)
-
-### Hardware
-Han port pinout (RJ12):
-1. 5V (max 250mA)
+Han port pinout:
+1. 5V
 2. Data request (connect to 5V to enable)
-3. Data GND
+3. GND
 4. NC
-5. Data (TX 115200 inverted open drain)
+5. DATA (TX 115200 inverted)
 6. GND
 
-PicoW connection:
-- Connect HAN port pin 1 and 2 to pico 5V
-- Connect HAN port pin 3 and 6 to pico GND
-- Connect HAN port pin 5 to pico 1 (RX)
-- Add pullup resistor (15k) between Pico RX pin and 3V3
+Add voltage divider to Pico RX pin:
+- 10k between pico RX pin and GND
+- 10k between HAN pin 5 and pico RX pin
 
 ![front](20220814_231222.MEDIUM.jpeg)
 ![back](20220814_231229.MEDIUM.jpeg)

main.py

@@ -45,6 +45,23 @@ wdt.feed()
 print("Setting up UART")
 uart = machine.UART(0, 115200,invert=UART.INV_RX)
 
+def readUntil(uartObject, termination, maxlen=-1, includeTermination=True):
+    terminatedFlag=False
+    result = ''
+    while maxlen < 0 or len(result) < maxlen:
+        if uartObject.any():
+            result += chr(uartObject.read(1)[0])
+            for terminal in termination:
+                if result.endswith(terminal):
+                    terminatedFlag=True
+                    if not includeTermination:
+                         result = result[:-len(terminal)]
+                    break
+            if(terminatedFlag==True):
+                return result
+        time.sleep_us(10)
+    return result
+
 def parse_han_protocol(data):
     data = data.replace("'b'", "")
     data_list = data.split("\\r\\n")