All posts in the 'Measurement projects' Category
Posted on 06 Jul 2008
This small, light weight digital SWR and power meter uses an Atmel AVR “Butterfly” demo board and a “Stockton” type directional coupler. It is built into a “Whitmans Sampler” candy tin. The display board is mounted to the lid of the tin, so the cover can be closed to protect the display when the unit is not in use or is in transport. This makes it an idea meter to use when traveling or in the field. [more]
Posted on 03 Jul 2008
This simple circuit is designed to report the temperature via any standard FM broadcast band radio at regular intervals. It uses a simple low bit rate tone signalling scheme which can be interpreted easily by both humans and machines. Such a device can be used stand-alone or as part of a PC-based weather station or HVAC system.[more]
Posted on 03 Jul 2008
This project is a 3-digit digital thermometer easy to build for beginner or hobbyits.PIC16F628 used to read digital value of temperature from a DS1820 sensor.All 7-segments drived by power logic 8-bit shift register TPIC6B595 with open collector output. For the 7-segment need 12V volt to drive because it have 3 LED per one segment.All segment no need to scan display. Source code programming with CCS C Compiler availible. [more]
Posted on 28 Jun 2008
Here is the instructions how to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The complete Assembly and Instruction Manual can be downloaded from the the following website.[more]
Posted on 25 Jun 2008
The circuit uses a constant current drive and a four wire connection to the probes. This allows almost any length of probe connecting cable without re-calibration.The current is set to 1.000mA. The circuit use MAXIM MAX4194 series of precision differential amplifiers. [more]
