Ultimaker Prusa MK2 Heated bed solution
After battling through the Ultimaker wiki and the reprap wiki to figure out how to get a heated bed working ont he Ultimaker, I decided to write up my solution.
The Documentation and information available the moment is pretty sketchy. After trying a couple of things and blowing up half my Ultimaker, I decided the wiki was a terrible resource, lacking in opertinent information at best, and leaving massive assumptions.
The biggest assumption on the ultimaker wiki is that you can connect the headed bed to the onboard FET driver directly. While this worked for me temporarily, the heat from the FET caused it to stop working. My advice is to NOT connect directly via the onboard FET and use a relay.
The instructions below are for how to connect a Prusa MK2 heated bed to the Ultimaker with board revision 1.5.6.
I am planning a small series of 3 hour hacks. Each hack will be allocated a 3 hour window only. There are penalties for failing to adhere to the rules. Points will start at 100 and count down. Rules are as follows:
Hack 1) Hard Drive CPU/RAM meter.
I have been messing around with getting Linux to boot on the HTC Kaiser, with the end goal of ditching windows. Presented is the LED hack. I am suffering from NIH syndrome on this one, but still cool.
EDIT: I got some emails asking how I got Android on there...XDA-developers tells you what you need to know. Other non-Kaiser HTC devices should check the XDA developers Wiki
EDIT2: The phone works in Kaiser! Nice work premy!
In a nutshell-> An LED on the phone keyboard is flashed on and off at high speed by incoming serial data.
The serial code that is normally used to talk to a hardware UART is horribly hacked to pipe all serial communications out through the fn led on the keyboard. This is then read by an LDR that is connected to an AVR ADC port. The ADC port then polls the LDR waiting for it to go over a defined threshold. For each 8 bits of on-off flash sequences form the phone, the AVR will combine and put them into a register ready for reading.
The PC then reads the data through USB from the AVR using Dick Streefland's usbtiny software USB stack.
In fact, the whole hardware is based on my OSIF board, with a couple of extra headers soldered on and some small code to parse for the flash sequence.
Because it's coooool.
In all seriousness I needed to get that data out of the device somehow. Copying log entries by hand is a pain.
Where are the pictures?
Yes, this is running Google Android :)
If you own a VW Passat, and also have some funky things happening with your electronics you probably have something wrong with your Comfort Control Module (CCM), or at the very least, the wiring harness.
If your Passat has these symptoms, in part or in full, you are almost certainly in for a rough time.
All of these things are controlled by a box called the Comfort Control Module (CCM) that sits in a box under the passenger floor panel (RHD). This box hold all of the key electronics that control all of the above functions. Unfortunately for us Passat drivers, there is a bloody awful problem with water getting into the foot well of that car, and ruining your fancy control electronics.
If you have, or suspect you have water coming into the car, I would highly recommend you follow this excellent guide to cleaning out the drainage holes by Ewan
After you have followed this guide, and you have removed the source of the problem, you will need to check all of your wiring, and also your CCM.
So how do you do it? I will try and give you a head start. I wasn't really prepared for what would be involved in this, and took some photos as a reminder to me... I always forget where all of those screws go.
As it turns out it wasn't too painful.
Things you will need
EDIT:- I removed the clip connections and soldered them while trying to figure out a different issue. It is much cleaner and I have more faith in this arrangement
The first thing to remove is the plastic trimming at the front of the door.
Below is a description of how to modify the compactGPS
to work with a standard serial port.
This mod will allow you to use the device using your PDA
serial port, a PC serial port, and a PDA/GPS car kit.
This device is a compact flash adapter for GPS If you are a walker or hiker, you should look at this device. It is very accurate, and has a very low data acquisition time.
This worked fantastically for me for 2 years, until I discovered TomTom. I purchased tomtom and installed it. This also worked fantastically. I could plug in the receiver, and get a location of my car!
The only problem I had was that I didn't have enough memory in the PDA to accomodate large maps. I was stuck with very small maps. The problem is that the GPS receiver uses the Compact flash port... The same port I need for a memory card upgrade
This became very annoying, and I went to work...
First I disassembled the GPS device (it was out of warranty) What I saw inside was a small device, and 5 wires connecting it to a compact flash card.
My first thought... only five wires? I could put an extension on that, make the GPS part separate. This would at least solve the problem of having to hold the PDA at silly angles the whole time. It could be placed anywhere... on the dash, or atop a rucksack.
So I went to it. This also worked fine. But still the problem of the small maps.
Extending the GPS cable
Different view of gps wiring
Building the module
Still waiting for the glue to dry