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enter image description hereI want to measure the battery voltage using voltage divider on different ADC channel, as shown in image i have to used 4 resistor and generate 3V, 2V, and 1V from 4V battery.

i want to measure all the voltage using different ADC channel of controller. but voltage is changed(Drops) when connected with the ADC pin(controller) and due to this ADC gives wrong reading.such as 3V down to 2.2V, 2V down to 1.4V and 1V down to 0.7V.

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    \$\begingroup\$ What ADC? Which one are you using? How is it configured? \$\endgroup\$ – Voltage Spike Sep 25 at 16:51
  • \$\begingroup\$ i used arduino to measure all the voltage and configure A0, A1 and A2 as analog pin to measure this voltage \$\endgroup\$ – shashikant prajapati Sep 25 at 16:53
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    \$\begingroup\$ Why would you need to make 3 separate measurements of the same voltage? All you need is one if using an ADC. \$\endgroup\$ – Voltage Spike Sep 25 at 16:54
  • \$\begingroup\$ i;m not measuring the same voltage, it is different such as 1V, 2V and 3V, i am new to battery monitoring and want to read multiple data at the same time \$\endgroup\$ – shashikant prajapati Sep 25 at 16:59
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    \$\begingroup\$ @shashikantprajapati - (a) Did you physically measure with a DMM that the voltages are 3V, 2V, 1V at points VA, VB & VC before attaching the Arduino? Or are you assuming that those voltages will be 3V, 2V & 1V? (b) Is the ground point of that resistor chain also connected to the Gnd of your Arduino? Since you are not showing the full schematic, we cannot make assumptions... (c) Please edit the question and add some clear, in-focus photos of your hardware, showing the wiring. (d) Are you saying that those voltages drop when measured with a DMM or when measured with your Arduino s/w? \$\endgroup\$ – SamGibson Sep 25 at 17:01

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