RS232 connectors displayed from the back for easy wiring .
This is the most useful way of viewing these connectors when constructing prototype or development boards as you need to be able to know where the pins are when holding a soldering iron to the back of the connector.
RS232 PIN OUT DIAGRAM Note: The pins of each connector are stamped on both sides of any D-type connector - but they are extremely difficult to see as they are only moldings so there is no colour difference. To see them you need a good light source and a jewellers loupe magnifier.
The RS232 pin out diagram is also useful for the other side of the connector you just have to make sure that you identify pin one correctly and then match the d-type to the diagram. (Looking from the front of the connector choose the opposite gender diagram).
On a 9 way d-type double check the position of 6 and 9 as you can easily muddle them up.
Always, Always, Always double, triple check your connectors if making a
pcb - this is where it usually goes wrong - use a 1 to 1 printed layout and
place the connectors on the print in their positions.
Jump from RS232 Pinout to
Best-Microcontroller-Projects Home Page
INA219: How to use the INA210 for maximum accuracy in current and power measurements
The Arduino shiftIn() function can simply can accept data from paralle to serial converter chips. Find out how it works and how fast it operates.
How to easily make a logic level converter e.g. between 3V and 5V.
The Arduino shiftOut() function can simply control many different serial interfaced chips. Find out how it works and how fast it operates.
A tutorial on using the ADS1115 precision 16 bit ADC for low power use.
Learn how to use the TP4056 properly. There's a right, and a wrong way, to use it to safely charge Lithium Ion batteries.