Dobrica Pavlinušić's random unstructured stuff
Orange Pi Plus 2: Revision 7
orangepiplus2_info.jpg

http://www.orangepi.org/orangepiplus2/

https://www.armbian.com/orange-pi-plus-2/

SoC H3 @ 1.2GHz[1]
DRAM 2GiB DDR3 @ ?MHz (H5TC4G83AFR-PBA)
NAND 16GB EMMC Flash (in 2016 KLMAG2GEND-B031 but now slower KLMAG2WEPD-B031)
Power DC 5V @ 2A (4.0mm/1.7mm barrel plug - centre positive)
Features
Video HDMI (HDCP, CEC), CVBS
Audio 3.5 mm Jack, HDMI, Microphone
Network 10/100/1000Mbps Ethernet (Realtek RTL8211E), WiFi 802.11 b/g/n (Realtek RTL8189ETV)
Storage �SD (max 64GB), SATA 2.0 (via GL830 USB-to-SATA bridge, +5V power on JST XH 2.5mm connector)
USB 4 USB 2.0 Host (via FE1.1s hub), 1 USB 2.0 OTG

bmp280 i2c temperature/humidity

/home/dpavlin/linux-gpio-pinout/overlay-load.sh /boot/dtb-`uname -r`/overlay/*h3*i2c0*

root@opip:/home/dpavlin/linux-gpio-pinout# i2cdetect -y 2
     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
00:          -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- 76 --

Check i2c address in datasheet

Connecting SDO to GND results in slave
address 1110110 (0x76); connection it to V DDIO results in slave address 1110111 (0x77)

root@opip:/home/dpavlin/linux-gpio-pinout# zgrep BMP280 /proc/config.gz
CONFIG_BMP280=m
CONFIG_BMP280_I2C=m
CONFIG_BMP280_SPI=m

root@opip:/home/dpavlin/linux-gpio-pinout# echo bmp280 0x76 > /sys/bus/i2c/devices/i2c-2/new_device
root@opip:/home/dpavlin/linux-gpio-pinout# [Sat Jan  2 11:43:58 2021] i2c i2c-2: new_device: Instantiated device bmp280 at 0x76
[Sat Jan  2 11:43:58 2021] bmp280 2-0076: supply vddd not found, using dummy regulator
[Sat Jan  2 11:43:58 2021] bmp280 2-0076: supply vdda not found, using dummy regulator
[Sat Jan  2 11:43:58 2021] bmp280 2-0076: bad chip id: expected 58 got 60
[Sat Jan  2 11:43:58 2021] bmp280: probe of 2-0076 failed with error -22

So it's not BMP280, but BME280.

Using https://www.raspberrypi-spy.co.uk/2016/07/using-bme280-i2c-temperature-pressure-sensor-in-python/
I downloaded and modified for python3 bme280.py

root@opip:/home/dpavlin# ./bme280.py
Chip ID : 96
Version : 0
Temperature : 24.65 C
Pressure : 998.4304559219445 hPa
Humidity : 41.458674890198445 %e