Posts Tagged ‘diy’

Croozer bike trailer alternate hitch


There’s a great local service in my home city Jyväskylä called Lastipyörälainaamo, where one can borrow electric bikes, cargo bikes and bike trailers for free. I’ve been thinking about buying a bike trailer to use with my son, so this was an opportunity to try one before buying.

They borrow the trailer with an electric bike, but I wanted to use my own. Since they don’t have extra hitch hooks and anyway the hook would not play well with the quick lock wheels (at least on my bike), I thought to make an alternate hitch.

This is how it looked like. My bike is Haibike SDURO SL.



DIY Interface cable to HeliCommand

26/10/2010 12 comments

Being somewhat lousy rc-helicopter pilot, I decided to invest to HeliCommand 3a stabilization unit. Unit itself is easy to install but it quickly became clear that pc-interface is almost necessary to operate the unit properly.
I did not want to order the cable separately since the cable is somewhat expensive and can be constructed for few euros. I hacked this circuit together by using some schematic I found from the web and the pictures about the cable pcb as a reference. Interface can easily be constructed on stripboard from easily available components.

The numbers on the leads are numbers for 9-pin D-female connector. Connector to HeliCommand is standard 3-pin female servo plug, where middle connector is not used. When connecting cable to HeliCommand, white wire goes towards the center of the unit. Note that on the pcb image two red squares mark the spots, where the copper strip needs to be cut. Remember to cut traces also under the resistors.

I glued the pcb inside some plastic box which I had laying around and it seems to work fine with the HeliCommand software.

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