Diagnose Checker for Wireless Bike Computers

When I was traveling by bike a few days ago, I noticed that my wireless bike computer stopped working. The quick method of repair by battery replacement unfortunately didn’t bring the desired success.To find out which part was defect - receiver or transmitter - I decided to construct a diagnose device for checking wireless bike computer.

To find out which part was defect - receiver or transmitter - I decided to construct a diagnose device for checking wireless bike computer.

How to do this you can read in the attached documents.

Revision 1
Piezo speaker added to the circuit to get an acoustically feedback also.
English and german documentation corrected.

Project Elements

Circuit (JPG, 111.24 KB)

BikeComputerDiagnoseChecker.zip (ZIP)

English documentation

FahrradComputerDiagnosetester.zip (ZIP)

Deutsche Dokumentation

Discussie (2 opmerking(en))

PaulDeadman 10 jaar geleden

Depending how old you are, you might be aware that back in the late 1970's, 'Electronics Today International' (no longer trading as I understand) published a project for a full radio in a tictac sweet box based on a ZN414 and at the age of 12 (and in the 1970's) I was amazed.....

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JoergT 10 jaar geleden

Hi Paul, 1979 I used such a TicTac box also and implemented a ZN414 radio. I coloured the box black and fixed 3 small solar cells on it. Some month later l travelled to the 'Funkausstellung' in Berlin and used this box in the bus. The light through the bus window was bright enough and the radio worked great. Other passengers asked me were I bought this radio. Well, that was a amusing experience :-) Best regards, Joerg

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Lucky 10 jaar geleden

Although both the TA7642 and the ZN414 are no longer in production, it looks like they're are still available.

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JoergT 10 jaar geleden

Hi, it should be noted that the original ZN414 is traded at exorbitant prices: http://www.donberg.de/descript/z/zn_414.htm?gclid=CIrn68mzwsACFY_MtAodUC0Atg The successor TA7642 is still widely available with prices starting at about 5 cents. An eBay shop offers 100 pieces for € 4.55: http://www.ebay.de/itm/100PCS-TA7642-7642-TO92-Single-Radio-Chip-IC-NEW-GOOD-QUALITY-TO2-/121135394679?pt=LH_DefaultDomain_0&hash=item1c343b6f77 A shortage of supply at present does not seem to exist. Best regards, Joerg

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Rube 10 jaar geleden

Nice application for those RF tag coils! Just a tip in case in doubt about the reed switch: at the moment the magnet passes the sensor, you can actually hear a (very) faint "click" coming from the reed switch. In my experience, hearing this click will almost certainly rule out a broken reed switch. This is also a great method to check whether the sensor and magnet are properly aligned without looking at the display of the bike computer or to find out the working range of the magnet. Cheers!

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