Dobrica Pavlinušić's random unstructured stuff
INA3221: Revision 7
{image: OUT INA3221 KACITRAN.jpg}
{toc: } ^ all grounds tied together, single input voltage I have two versions of this modules purple and black, and they seem to have same problem: * http://goingbacktoelectronic.blogspot.com/2017/09/ina3221-weird-wiring.html * http://goingbacktoelectronic.blogspot.com/2017/09/fixing-ina3221.html Alternative source with better pictures of modifications for multi-voltage support: * https://kacitran.blogspot.com/2018/10/ina-3221.html ^^ simplest modifications with just three holes and three wires {image: ina3221-800px.jpg} Cutting traces on both sides of board seemed like too much for me, so I decided to use hand drill to scratch top side of board at three places and disconnect ground and power input from resistors. Add three wires to connect new pin to connect load to or just connect any dupont wire to use it as 10-bit voltage adc. ^ Linux setup .pre root@cubieboard:/home/dpavlin# modinfo ina3221 filename: /lib/modules/4.19.25-sunxi/kernel/drivers/hwmon/ina3221.ko license: GPL v2 description: Texas Instruments INA3221 HWMon Driver author: Andrew F. Davis <afd@ti.com> alias: of:N*T*Cti,ina3221C* alias: of:N*T*Cti,ina3221 alias: i2c:ina3221 depends: intree: Y name: ina3221 vermagic: 4.19.25-sunxi SMP mod_unload ARMv7 thumb2 p2v8 root@cubieboard:/home/dpavlin# i2cdetect -y 2 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: 40 -- -- -- -- -- -- -- UU -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- -- root@cubieboard:/home/dpavlin# echo ina3221 0x40 > /sys/bus/i2c/devices/i2c-2/new_device [Sun May 12 14:23:20 2019] i2c i2c-2: new_device: Instantiated device ina3221 at 0x40 root@cubieboard:/home/dpavlin# sensors pcf8591-i2c-2-48 Adapter: mv64xxx_i2c adapter in0: +2.13 V in1: +2.55 V in2: +0.01 V in3: +1.32 V ina3221-i2c-2-40 Adapter: mv64xxx_i2c adapter in1: +0.02 V in2: +0.02 V in3: +0.02 V in4: +0.00 V in5: +0.00 V in6: +0.00 V curr1: +0.00 A (max = +16.38 A, crit max = +16.38 A) curr2: +0.00 A (max = +16.38 A, crit max = +16.38 A) curr3: +0.00 A (max = +16.38 A, crit max = +16.38 A) # setup correct resistors: root@cubieboard:/home/dpavlin# grep -A 2 ina3221 /etc/rc.local echo ina3221 0x40 > /sys/bus/i2c/devices/i2c-2/new_device sleep 1 ls /sys/devices/platform/soc/*.i2c/i2c-2/2-0040/hwmon/hwmon1/shunt*_resistor | xargs -i sh -cx 'echo 100000 > {}' .pre |