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“Bluetooth Multimeter is an intelligent peripheral of android phones, specially designed for engineers. Not only can it easily collect data such as voltage, current and resistance etc., this multimeter can also communicate with phones via bluetooth. Thus, the data gathered will be displayed on your phones.”
Totally open source, including hardware, software & Android API. Learn how to create a Platform to connect smartphones with the real life.
The Bluetooth Multimeter is based on Atmega328 – Arduino Pro. It measures the voltage and resistance and current input from the headphone jack, and then sent these data via the Bluetooth frame.
This Bluetooth Multimeter is a portable multimeter, a device that gathers the voltage, resistance and current. and then sent these data to other device via Bluetooth, so, we could display the data through other devices, such as Android, PC and so on.
Open Source Electronics. Hardware and gadgets. Embedded Cards with Support Cards and Components. Be in Sync. with the Embedded Electronics for Quick Prototyping and Gadget Creation.
There’s enough stuff in this pack to build 2 full gadgets, with a wide screen, or two player, or angled, or multi-colored, with enough power to run for over 24 hours straight. That’s pretty intense. If you think you can handle it, the Ultimate Gadget Pack’s the perfect kit!
Neapolitan pizza of Open Source hardware and Arduino modules.
Ultimate Gadget Pack – Liquidware
It Includes many things, some listed below …
- Arduino Duemilanove
- TouchShield Stealth
- TouchShield Slide
- Open Source Hardware, Volume 1
- Mini black Protoboards
The PICList is a collection of people interested in the Microchip PIC and other similar processors who have requested that email sent to the PICList email address be forwarded to them. From the mass mind of these people the following have grown:
James Newton of Massmind.org helps hosting the piclist site and editing and organization of the PIC FAQ. The PICList mailing list is hosted by MIT.
The design is essentially a double evaluation board for the chips 18F4550 and 16F877A. It contains also a MAX232A serial module having two transmitters and two receivers with the ability to connect either to 4550 or 877 microcontroller. Each microcontroller port ends up to a pin header in order to give interconnection capabilities to the board for future experiments.
The top of the sNQ Shorty looks much tidier than its big brother, here the experience gained with the first work increases. The cables between the control unit and the LEDs and the motors are now laid on the underside of the circuit board and lead through the holes to the pads provided for this purpose.
“After initial flight tests I can confirm the function of the Mega328 with 16 MHz at 3.3 V operating voltage. Of course, one must be aware that the chip is operated outside its specification and no one can guarantee that the two chips and the ?C function are compatible with all possible conditions. It may well be that the shorty in the living room at 20 ° prima flies, then one opens the door and there comes cold air into the room, the copter simply crashes.”
“With the sNQ Stretcho, we pushed the motors down as far as possible through the brackets, because this would dampen or even suppress vibrations due to the engine running, and disturbances of the IMU chip largely fall away. In the case of the sNQ Shorty, this can only be implemented to a limited extent, …”
“This page is the result of a lot of effort over the past couple years to develop a quality, inexpensive device to test shutters on the classic film cameras that I have been using…” .. Mike
Once built, this counter timer/device is easily adapted to a wide variety of applications, simply by construction of a new sensor. Although designed to be used with photo-transistors, this device can also use relays, transistors and many other kinds of electrical switches as a sensor.
Model Railroading, 3 Transistor Audio Preamp for a Dynamic Microphone
Configuration and control of this counter/timer is through a RS232 port. Cable configuration for a usual PC compatible would consist of a null modem cable, with a female connector on the timer/counter end of the cable. The correct cable for a PC or usb to serial adapter with a DB-9 interface is listed in the bill of materials.
delabs Page Digital Timers Counters and Clocks
The new Ham Project Pages are VHF/HF Aerial Analyser, A 600MHz Frequency Counter. Then there is a an ESR Meter for Electrolytic Capacitors.
With a two tone tester, a dummy load and an oscilloscope, a transmitter can be really put through its paces. Two tone testing consists of applying two clean non-harmonically related sine waves of approximately equal amplitude to the audio input of an SSB transmitter.
The sine waves are typically around 600 – 700Hz and 1800 – 2000Hz i.e. about 300Hz from either end of the audio pass band.
This project was published in the September 2004 issue of the Australian magazine “Amateur Radio”.
Other Readworthy Pages
- Easy PCB’s Made With Kitchen Appliances
- How to Make a Q Meter
- Making a High Current 13.8 VOLT Supply For SSB Transceivers
- VK5MM’s excellent amateur radio homepage
- Transformer Construction Details
- Shortform Method of Designing Power Transformers
The photos at VK5JST Homepage are very educative and express the idea better than words. – delabs
They specialise in online mail order electronics for industrial, educational and domestic applications. The company’s founder started selling electronic kits back in 1993 .
Electronic Kits, Modules, Hobby Projects UK Superstore. A specialist retailer and manufacturer of electronic kits and modules with over 20 years experience.
From electronic starter kits and project labs for kids to hi-fi quality valve audio amplifier kits for audiophiles and industrial controller boards for commercial applications
Official distributor stockists for Velleman, Cebek, Smart Electronics and Quasar Electronics. They also have power supplies, inverters, cables, leads, components, connectors,tools, soldering irons, multimeters, function generators and oscilloscopes.
Quasar Electronics Limited
PO Box 6935, BISHOPS STORTFORD, Hertfordshire CM23 4WP
UK – England & Wales