Tagged Questions

-1
votes
3answers
138 views

tiny dtmf dialler [closed]

I would like to create a small dtmf dialler that connects to a telephone line and dials a single preprogrammed telephone number when a set of contacts closes, how easy is this and how small could this ...
1
vote
2answers
166 views

Cheap USB device for capturing state of ~64 sensors

I've been researching home security systems. Honeywell, GE, DSC, Napco - all seem expensive and behind the times. I want private monitoring of my doors and windows, partitioned to floors of my home ...
5
votes
2answers
586 views

Sensor Polling via USB-RS485 Serial Interface stuck at 16ms, even though it should be faster

I have a setup, connecting a Razor IMU sensor board, with a RS-485 Breakout board, to a USB-RS485 Serial Interface via USB-cable into my laptop. I run a software on the laptop (Max/MSP) that sends out ...
1
vote
5answers
1k views

Connect a light sensor to PC

I want to connect a light sensor to my PC ( serial or usb ) and read the values of that sensor. Is there a way i can do this without a microcontoller? I am looking into the cheapest method of ...
4
votes
3answers
288 views

Sensing when micro USB power cable is unplugged from a smartphone (or other device)

I am looking to create a charging device that can provide 5v power to charge a smartphone (or other consumer electronics device) via micro USB. How would I go about making this charging device "aware" ...
5
votes
3answers
619 views

Problems with a RFID reader from SparkFun

I am hoping someone here can help me. I am having trouble with a RFID kit I bought from SparkFun. I purchased the USB RFID (SEN-08852) with the RFID Reader ID-12 (SEN-08419) and some RFID cards. ...