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description: Paper circuits GIF's, Ohm's law, schematic circuit
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# Assignment 1 - Paper circuit

## Intro

I haven't done this assignment at school but during the Corona virus at home. So I didn't have a coin cell battery at home and a piece of velostat, instead I used a normal battery (3x AA) and a piece of ESD foam for the sensor.\
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I also couldn't measure the values of the circuit because I don't have a multimeter at home.

## Paper circuits

### Standard paper circuit

The circuit starts at the + of the battery, the current goes through the LED and then the 220 ohm resistor reduces the current flow and then the circuit ends at the - side of the battery.\
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This was my setup for the paper circuit with the LED and 220 ohm resistor:

![Paper circuit switch, Dusanka, 2020](https://2472482582-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LzaCPWnWmmX17D0w0O3%2F-M3zlzZjWymAOOUmDSEd%2F-M4-4jxmJB82HT9xhaEu%2FWhatsApp%20Image%202020-04-03%20at%2014.45.29.jpeg?alt=media\&token=ac779d5e-f9c4-4e7c-aedb-1faf5e7a582f)

![Paper circuit switch, Dusanka, 2020](https://2472482582-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LzaCPWnWmmX17D0w0O3%2F-M3zlzZjWymAOOUmDSEd%2F-M4-4qdMKP8N2QU9ML4I%2Fezgif.com-crop.gif?alt=media\&token=88efd62f-c9d2-4672-9c19-98debc5d1085)

### Sensor paper circuit

For this circuit I've used ESD foam for the pressure sensor instead of velostat to connect the 2 conductive traces. The harder you press on the sensor the more resistance flows through the circuit.\
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Unfortunately it didn't work and i'm not exactly sure why. I've connected the LED's + on the right side and the trace was smooth (no rips in the tape). I also made sure that the copper tape was _under_ the sensor.&#x20;

![Paper circuit sensor, Dusanka, 2020 ](https://2472482582-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LzaCPWnWmmX17D0w0O3%2F-M3zlzZjWymAOOUmDSEd%2F-M4-6MYXlZh8prhbZlru%2FWhatsApp%20Image%202020-04-03%20at%2014.45.28.jpeg?alt=media\&token=4fccc0a1-0bd6-44ab-8af5-d1c54ddd301b)

## Ohm's Law explained

Ohm's Law shows a relationship between the voltage (V/U) and the current (A/I) in an electrical circuit.\
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The current passing through a resistor between two points is related to the voltage difference between two points, and are related to the resistance (R/ohm) between two points.\
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It is important because with Ohm's Law you can control the amount of current in a circuit, adding resistors to reduce the current flow and taking them away to increase the amount of current.

## Schematics

The first paper circuit (standard):

![Schematic, Dusanka, 2020](https://2472482582-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LzaCPWnWmmX17D0w0O3%2F-M3zlzZjWymAOOUmDSEd%2F-M4-B-lgJH2txSBy30l_%2FWhatsApp%20Image%202020-04-03%20at%2015.16.35.jpeg?alt=media\&token=253a2c45-8d82-48a9-ae11-19eeb7beac00)

The second paper circuit (sensor):

![Schematic, Dusanka, 2020](https://2472482582-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LzaCPWnWmmX17D0w0O3%2F-M3zlzZjWymAOOUmDSEd%2F-M4-BD25kVhkuSoZxNMq%2FWhatsApp%20Image%202020-04-03%20at%2015.16.35%20\(1\).jpeg?alt=media\&token=419495ac-0e1e-45da-b452-639f8691dc3b)
