KAP RC Tx Miniaturisation

Small is beautiful. Having got a working Arduino based remote control for the RC rig and sucessfully testing the manual/auto function a smaller, handier option is possible. Looking at the available cases I found options that are small enough and include a battery compartment fairly scarce, after far too much browsing I found this by Takachi:

Takachi-W-H-series-case_01.This is the IP67 version of the Takachi series case. Part No: WH 145-20-F4-BY . The threaded fixings are steel to brass. It is supplied with a battery holder for 4x AAA batteries and has an internal space just big enough for the components required.  On test the set ran for 4 and half hours on 4xAAA batteries. In that time the power supply had dropped from 4.99v to 3.56v. I don’t expect to maintain the IP spec, the tilt slider alone ruins the enclosure but starting with a tough case seems like a good idea. T4-Assembly_02

Solder and wrap. With practice I was able to use a 14 x 20 hole matrix board to mount the Micro Pro, RF unit and DIP switch. I soldered a wire across the ‘on’ side pins of the DIP switch for the -ve contact and wrapped soldered tails from each pin to it’s control on the Micro Pro. The height inside the Takachi case meant the board had to be cut down and the RF unit placed separately to fit:

The rats nest of long tails lets the lid mounted stuff survive the fit -re-fit process and keeps access to the USB input for sketch updates. The case is heavy duty ABS which makes cutting holes in it a bit of a fiddle. A wood drill whistles through it but a swiss file clogs horribly, a high speed tool like a Dremel melts it with a disgusting smell.

Tx evolution. It’s been something of a challenge but getting the Arduino controller down to pocket size saves a huge amount of space in my luggage and adding the power of automation seals the deal for me: without major modificaton to the RC rig I have optimised control.

About billboyheritagesurvey

Heritage worker
Gallery | This entry was posted in KAP and tagged , . Bookmark the permalink.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s