Any electronics (component) experts on here that could help?

Any electronics (component) experts on here that could help?

Author
Discussion

anarki

Original Poster:

762 posts

137 months

Monday 21st January 2019
quotequote all
Long story short, I want to add a 9pin serial header to my TP-Link wireless access point.

It isn't as straight forward as soldering an RS232 header to points on the motherboard, it requires a serial converter board (MAX3232) in-between.

I have the diagrams and understand the requirement for 0.1uf capacitors and the requirement to bridge pins 1 and 3, pins 4 and 5 with them but I'm out of my depth with the rest of it. I'm pretty handy with a soldering iron, I just need baby steps on what goes where. As the picture shows it looks like they've used a breadboard - whereas I'd probably do without that if feasible - again thoughts on that?

Any help would be much appreciated.

Access point mainboard:


MAX3232 wiring diagram


MAX3232 board


9pin male header

peterperkins

3,152 posts

243 months

Monday 21st January 2019
quotequote all
Difficult to see what is going on, but a few comments.

What is the purpose of this?

I don't like that apparently uninsulated bare copper wire used for the connections, it must be enamelled, but that's rubbish IMO.

The soldering at P1 looks a mess.

Keep all the wires a short as possible, not looping round the board like that.




anarki

Original Poster:

762 posts

137 months

Monday 21st January 2019
quotequote all
Just to clarify that is not my picture, that was taken from the OpenWRT website. I will not be using bare wire when I undertake my install.

The purpose is to install custom firmware onto the access point.

Mr Pointy

11,255 posts

160 months

Monday 21st January 2019
quotequote all
anarki said:
Long story short, I want to add a 9pin serial header to my TP-Link wireless access point.

It isn't as straight forward as soldering an RS232 header to points on the motherboard, it requires a serial converter board (MAX3232) in-between.

I have the diagrams and understand the requirement for 0.1uf capacitors and the requirement to bridge pins 1 and 3, pins 4 and 5 with them but I'm out of my depth with the rest of it. I'm pretty handy with a soldering iron, I just need baby steps on what goes where. As the picture shows it looks like they've used a breadboard - whereas I'd probably do without that if feasible - again thoughts on that?

Any help would be much appreciated.
The chip is mounted on a bit of veroboard which is about as simple as you could get it. You can't just solder the capacitors onto the legs.
https://www.ebay.co.uk/itm/5-x-Vero-Style-Strip-Bo...