Raspberry Pi Raspbian

• https://www.raspbian.org
• https://www.raspberrypi.org/documentation/remote-access/ssh/

einfach ein leeres file namens ssh auf die boot partition kopieren.

• default user/passs

Distribution   | Username   | Password
---------------|------------|-------------
Debian Squeeze | pi         | raspberry
Arch           | root       | root
QtonPi         | root       | rootme
Raspbian       | pi         | raspberry
OpenElec       | root       | openelec

timesyncd

• https://raspberrytips.com/time-sync-raspberry-pi/

edit /etc/systemd/timesyncd.conf and uncomment ntp section!

sudo systemctl enable systemd-timesyncd --now
timedatectl
sudo timedatectl set-ntp false
sudo timedatectl set-ntp true
timedatectl show-timesync

Sensors, InfluxDB, MQTT and Grafana

• https://www.survivingwithandroid.com/raspberry-pi-iot-sensors-influxdb-mqtt-grafana/

GPIO

• https://www.raspberrypi.org/documentation/usage/gpio/
• https://www.instructables.com/id/Controlling-Any-Device-Using-a-Raspberry-Pi-and-a-/

sudo apt-get install rpi.gpio
sudo apt install python3-rpi.gpio
sudo apt install wiringpi

• https://electropeak.com/learn/tutorial-raspberry-pi-gpio-programming-using-python-full-guide/

import RPi.GPIO as GPIO 
from time import sleep 
GPIO.setwarnings(False) 

pin = 4
 
GPIO.setmode(GPIO.BCM) 
GPIO.setup(pin, GPIO.OUT) 
 
while True: 
    GPIO.output(pin, True) 
    sleep(1) 
    GPIO.output(pin, False) 
    sleep(1) 

analog digital converters ADS1015 / ADS1115

https://piddlerintheroot.com/analog-to-digital-converter/

sudo i2cdetect -y 1

networking

Note: With stretch release networking is configured in /etc/dhcpcd.conf

static eth0:

# Example static IP configuration:                                              
interface eth0                                                                  
static ip_address=10.1.0.101/24                                                 
#static ip6_address=fd51:42f8:caae:d92e::ff/64                                  
static routers=10.1.10.1                                                        
static domain_name_servers=10.1.0.1 8.8.8.8   

• https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md

default if names

• https://www.bitblokes.de/2017/08/raspbian-stretch-netzwerk-schnittstellen-heissen-anders-aus-eth0-wird-enxmac-adresse/

add to cmdline.txt:

net.ifnames=0

wifi

generate config string via

wpa_passphrase ssid pw

add config entry via

/etc/wpa_supplicant/wpa_supplicant.conf

• copy wpa_supplicant.conf to boot partition!

SSH

To enable SSH-Server create an empty file /boot/ssh or /boot/ssh.txt

webcam

• https://tutorials-raspberrypi.de/raspberry-pi-ueberwachungskamera-livestream-einrichten/
• https://siytek.com/raspberry-pi-rtsp-to-home-assistant/
• https://www.raspberrypi-spy.co.uk/2017/04/detection-area-masking-in-motioneyeos-raspberry-pi/

moisture sensor

# sudo pip3 install adafruit-circuitpython-ads1x15
import time
import json
import board
import busio
import adafruit_ads1x15.ads1015 as ADS
from adafruit_ads1x15.analog_in import AnalogIn

max_val = None
min_val = None

# Create the I2C bus
i2c = busio.I2C(board.SCL, board.SDA)

# Create the ADC object using the I2C bus
ads = ADS.ADS1015(i2c)

# Create single-ended input on channel 0
channels = [AnalogIn(ads, ADS.P0), AnalogIn(ads, ADS.P1)]

print("------{:>5}\t{:>5}".format("raw", "v"))
while True:
    for can in cannels:
        print("CHAN 0: "+"{:>5}\t{:>5.3f}".format(chan.value, chan.voltage))
        time.sleep(0.5)

• https://piddlerintheroot.com/capacitive-soil-moisture-sensor-v2-0/
• https://tutorials-raspberrypi.de/raspberry-pi-giessomat-kapazitiver-erdfeuchtigkeitssensor/
• https://how2electronics.com/interface-capacitive-soil-moisture-sensor-arduino/
• https://maker.pro/raspberry-pi/tutorial/interfacing-soil-moisture-sensor-with-raspberry-pi

Problem: kein analoger GPIO

• normalerweise wird ein MCP3008 Wandler benötigt
• https://iot4beginners.com/analog-inputs-for-raspberry-pi-using-the-mcp3008/
• Es geht aber auch via RC Schaltung:
• https://www.raspberrypi-spy.co.uk/2012/08/reading-analogue-sensors-with-one-gpio-pin/
• https://www.gadgetexplained.com/2016/05/4-ways-to-get-raspberry-pi-to-read.html