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5 votes
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Base resistor R2 for voltage bias

From the top Follow along: simulate this circuit – Schematic created using CircuitLab On left, is the starting schematic. I left the wire at the top of \$R_1\$ and \$R_{_\text{C}}\$ intact, to ...
periblepsis's user avatar
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3 votes
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Is it possible to connect ATMEGA328 to type-C and read data without a USB-TTL converter?

The Mega328 does not have an USB interface. It is still technicaly possible to use software bit-banged VUSB interface with it, but it's a trick and will only allow very low speed communication at high ...
Justme's user avatar
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2 votes

Basic questions about circuit diagram

The symbol in blue rectangle is a symbol for ground. It's not a physical component, it just means, this connects to ground, in any way you need to do it. The caps marked with yellow as .01 are likely ...
Justme's user avatar
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2 votes
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Custom i2c with Arduino UNO

Is it possible, yes, and has been done many times already. It can be done with GPIO ports. You can mimic SDA port with an external transistor and a pull-up, but usually nobody does it because it can ...
Justme's user avatar
  • 130k
2 votes

Can a transistor replace a switch that closes ground to an input?

Yes, you could use a transistor. But it is safer to use an optocoupler. Less risk of something going wrong and damaging your camera. The optocoupler part number is not critical, something like a 4N35. ...
Mattman944's user avatar
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2 votes

Is it possible to connect ATMEGA328 to type-C and read data without a USB-TTL converter?

Atmega328 does not have a hardware USB implementation, so you should better use something like atmega32u4 or atmega16u2. But, you can use a software implementation of a low-speed USB protocol, V-USB. ...
sx107's user avatar
  • 1,075
1 vote
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How to connect BMP390 to arduino?

With a level shifter. If you don't want to design one, buy a BMP390 module with built-in level shifter.
Justme's user avatar
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1 vote

How to write a lookup-table into an 28C64 parallel EEPROM?

To turn spreadsheets into C array code, I have typically done the following, although I use LibreOffice instead of Excel, there should be something similar possible. In column F (eg F4), create a ...
user85471's user avatar
  • 261
1 vote

wrong voltage reading with DMM after a voltage divider

Everything is correct. Your proximity sensor is an NPN-type output sensor. With internal \$10k\Omega\$ pull-up resistor. So the actual circuit looks like this: simulate this circuit – Schematic ...
G36's user avatar
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