A while ago we talked about the Bus Pirate, a device made by the people from Hackaday, which connects to the PC using the USB port, supports most serial protocols and possesses lots of other useful features and can be very helpful in testing various chips and circuits. The Bus Pirate requires a probe cable to connect to the circuit itself and this can be difficult depending on the circuit or the PCB.
The probe cable has a 2×5 connector at one end and a probe on the other end. The 2×5 connector goes into the I/O pins of the Bus Pirate and the test ending (which can be an alligator clip, a test hook or a tweezer probe) goes on the circuit you’re testing. Alligator clips should have a rubber cover to avoid any short circuits and this should be installed before soldering the wire to the clip.
Test hooks are fit for testing headers or various through-hole components, but their size can be a problem when you want to place more of them on a crowded PCB. The test hooks also have a casing made of non-conducting material to prevent accidental short circuits and can be easily soldered to your cable.
Another testing device is the tweezer probe, which has small retractable tweezers that can easily attach to surface mount chips. Most of them can be opened up and soldered using the solder metal tab. Tweezer probes are very secure because there is little metal exposed, so short circuits are very rare.
Of course, you should choose the testing probe that best fits your needs. All of these have their place and can make your life a lot easier if used correctly. Happy hacking.
Bus Pirate Extension – Probe Cable: [Link]
An electronic circuit is assembled inside a CD case with a headphone jack on the side. The device plays back 40 minutes of low-fi 1-bit electronic musicâ€”the lowest possible digital representation of audio. The device is available for $25 and it’s sold as a form of art.
40 Minutes Of Low-Fi 1-Bit Electronic Music: [Link]
This is one of the smallest fan controllers I’ve seen. It does the same job as others, it controls the fan speed according to a temperature sensor. The main utility is that you save power this way, and second its noise reduction, the fan will now run most of the time at lower speeds. The whole circuit its based on 3 parts:
- A MOSFET Power transistor (N-Channel), price between $1 and $2
- A 10K spindle trimming potentiometer, price around $1
- A 10K NTC temperature sensor, price around $1
These are really easy to get parts, so you wont have any trouble. As a last word this is a very useful and simple to build project. Good luck building it.
Fan Temperature Controller: [Link]
This is a very small telephone exchange system with two ordinary telephones attached. Full bi-directional facility with an intercom system: when a phone is in off hook condition , the circuit will detect it & send ringing pulse to the other phone. When it will be picked up , the connection will be established between both phones. This will take place vice-versa also. This project sounds great if you need a simple and efficient communication system, like in a tree house, you place on telephone in the tree house and the other one in your house. This is just an example but there are far more applications for this system.
Two way telephone system: [Link]