So I read the schematic of the L476RG, and you are correct it is connected to 3V3 as well. Its unsurprising since most MCUs operate at that voltage range anyway.

The ADC is set to a 12-bit resolution and the sample size is at 1.5 cycles, I tried increasing the sample size but this didn't seem to do much.

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I've noticed almost a 30% error in the com port that I'm reading from an L476RG I have hooked up to via some external wires and I'm not exactly sure how to make it more accurate. For example, the current ADC voltage value I'm reading is 2.36 on PuTTY but on my multimeter, I only see 1.86 volts.

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The ADC works in that way that it outputs value which represents the ratio between input signal and the ADC reference voltage, which is connected to VREF+ pin of STM32 (in small packages VREF+ is connected internally to VDDA).

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I'm multiplying it by 5 because I am using pin A5 on the L476RG to read the value of the gas sensor, and that board is plugged into my computer and powered off of 5V, I have no way off reading directly off of my PCB bc I messed up with the pin configuration for USART and chose a UART IC instead. This was from reading the pinout incorrectly on the datasheet.

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I know this isn't exactly the best way to do this, but I don't see any other way since there's no room on the pads of the MCU to solder a wire directly to it. I'm also assuming the cable length doesn't help.

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I recently have been working on a custom board with the stm32f030f4p6 for a gas sensor project, I just got it to bootload successfully and blink some LEDs so now I'm using the ADC channel to read values from it and converting it to a voltage level for testing sake (the final code will convert the values in ppm).

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Right now I have a wire soldered on from my gas sensor to a breadboard, with both grounds of the PCB and L476RG connected, and the analog pin from the L476RG connected after a resistor:

Unfortunately, when I made this board I didn't realize I read the datasheet wrong and chose a UART IC when this MCU can only use USART, so I have no way of reading from the terminal without using the L476RGs ADC port and I feel using two MCUs for one setup also isn't helping.