Preconfigure

To enable i2c, mount the boot partition to "/mnt":

mount /dev/mmcblk0p1 /mnt

and open the config.txt file.

vi /mnt/config.txt

Search for i2c and change the line

#dtparam=i2c_arm=off

to

dtparam=i2c_arm=on

How to start on boot

cd /etc/rc5.d/
echo /home/start.sh > S99start-ambiant.sh
chmod a+x S99start-ambiant.sh

How to start efficiently

Start

./start.sh

How to start manually

In Raspi, start I2C modules

insmod /home/i2c-bme280.ko
echo "bme280 0x76" > /sys/bus/i2c/devices/i2c-1/new_device

Start webserver

iptables -P INPUT ACCEPT
python3 /home/server.py

Read from server

wget -qO- stdout 127.0.0.1:80

Start ambient light

python3 /home/ambient-light.py -c

See temperature output on console

watch -n 0.2 cat /sys/devices/platform/soc/20804000.i2c/i2c-1/1-0076/temperature