From ac8952d8aa16466ec9b813635922a57707e1c469 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Sun, 22 Sep 2019 23:08:48 +0200
Subject: geht erst mal irgendwie

---
 sensor.c | 40 +++++++++++++++++++++++++++++++++-------
 1 file changed, 33 insertions(+), 7 deletions(-)

diff --git a/sensor.c b/sensor.c
index 2c933da..f764817 100644
--- a/sensor.c
+++ b/sensor.c
@@ -23,16 +23,42 @@ int main() {
 
 	pinMode(9, PINMODE_OUTPUT);
 	digitalWrite(9, HIGH);
-	pinMode(8, PINMODE_OUTPUT);
 	pinMode(9, PINMODE_INPUT);
+	pinMode(8, PINMODE_OUTPUT);
+
 	while(1) {
-		printf("Writing to GPIO %d: High\n", 8);
+		// start bit
 		digitalWrite(8, HIGH);
-printf("Reading from GPIO %d: %d\n", 9, digitalRead(9));
-		usleep(100000);
-		printf("Writing to GPIO %d: Low\n", 8);
+		usleep(18000);
 		digitalWrite(8, LOW);
-printf("Reading from GPIO %d: %d\n", 9, digitalRead(9));
-		usleep(100000);
+		long int cycles = 0;
+		int last_state = digitalRead(9);
+		// ignore 2 bits: reaction on command + "official" start bit
+		int bit = -2;
+		char data[5];
+		memset(&data[0], 0, 5);
+		while (cycles < 100000) {
+			cycles++;
+			if (last_state == digitalRead(9))
+				continue;
+			if (last_state == 1) {
+				if (bit >= 0) {
+					if (cycles>400) {
+						printf("1");
+						data[bit / 8] |= 1 << 7 - (bit % 8);
+					} else
+						printf("0");
+					if ((bit+1) % 8 == 0)
+						printf(" ");
+				}
+				bit++;
+			}
+			cycles = 0;
+			last_state = 1-last_state;
+		}
+		if ((bit == 40) && ((data[0]+data[1]+data[2]+data[3]-data[4]) % 255 == 0))
+			printf(" %f %f", data[0] + data[1]/256., data[2] + data[3]/256.);
+		printf("\n\n");
+		sleep(2);
 	}
 }
-- 
cgit v1.2.3-54-g00ecf