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I used different approach. I cut the trace on pcb of i2c backpack, between the PCF8574 and transistor. Remove pull up resistor from base of transistor. On my pcb i added pull down resistor to D6 on arduino and connected wire to base of transistor. Everything working as i want.

Well, if I put viktor_au last sample code into my project it does not working as is should. I wrote some other sample code (i think is better, because it does not affects on whole flowchart, because of delay function). Attached code is working in simulation mode and on hardware. But.... :? I figured...

Charts are posted in first post. One with 5 sensors (Merjenje_temp_zalogovnika_OK)-> (working) and one with 6 sensors (Merjenje_temp_zalogovnika_NE_6T)-> (not working).

He ask me to post this pic. He gets multiple warnings in compiler, but he don't know meaning (me neither).

@viktor_au: yours flowchart works in sim and hardware to. I only had to change i2c data line from C3 to C5. Thank you.

Medelec35 chart does only blinking (1s-on/1s-off). I use this before for warnings, but in normal condition the lcd backlight was on. Now I want to backlight stay off until the button is pressed. I posted flowchart with this function in first post, but it only work in simulation mode.

Schematic of i2c backpack interface is something like this. I also tried different versions to turn it off via i2c, but with no success. It does blink, like @medelec35 wrote, otherwise it remain on.

Jumper is in, but in settings tab i only see this

Hello

I wrote simple program to control backlight on LCD 2X16 I2C. In simulation everything works fine, but in real life not. Backlight is always on. Using arduino nano, push button connected on D2 pin, lcd using i2c in pins C4 and C5.

Friend tried same program on Arduino Mega2560. Everything works. Even 7 sensors. Is it possible that nano is not capable of reading more than 5 sensors same time? He send me screenshots. When reading 5 sensors works ok, when connect 6th sensor, strange things happens. Something with rs232 maybe?

Power is from arduino board.

"I can understand the thinking in having individual devices rather than a string. I don't have Flowcode on this machine to look at his code but from what I've read it is five sensors on whatever port(s) and all is good, but when a sixth is added they all stop working." Correct "Is it always the same...

Yes, he know how 1wire works, but he need to read ID of each sensor. If you have 1 sensor on 1port, you don't need ID. If one sensor stop working, you can simply replace with new one.

Hello Friend of mine wants connect multiple sensors (DS18B20) to arduino nano via 1wire protocol. Each sensor is connected to different pin. If he connect 5 sensors (example: ports PC0 to PC4) everything works fine. If he connect another sensor (PC5), everything stops. He also tried other ports, or ...

Thank you for input. Yes, I saw that example. But I also find this topic, here on forum. The last two examples are very helpfull. I made it that way and I get pwm signal with 10Hz frequency.

I'm testing some pwm program with pic 12F617. Everything works fine, but I wonder how to set frequency of pwm to 10Hz or less. If I set clock speed to 1MHz and prescaler divide to 16, I get only 61,03516 Hz.

I did this. Working fine

Hello First of all, sorry for my poor english :wink: I instaled flowcode v5 demo (picmicro). I wrote simple program with switch and 3 leds. When i start the simulation one led is blinking, if the switch is on, first led stop blinking and second start. Third led is only for indication if switch in on...