Electronics

Projects

• /anemometer - measuring rotation.

• simple fm transmitter http://anarchy.translocal.jp/radio/micro/howtosimplestTX.html

Basics

How-To: Build BEAM Vibrobots
http://www.streettech.com/modules.php?op=modload&name=News&file=article&sid=1618&mode=flat&order=0&thold=1

Lecture 1 - Background and Power Supply
http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=57&page=7

FM Transmitter
http://africatravels.pbwiki.com/RadioTransmitterCircuits

Useful bits

1381 voltage detector
http://members.aon.at/sunbeam/1381.htm
http://www.solarbotics.com/products/1381/

pn2222 transistor
insert url (how is this useful?, see at http://cachefly.oreilly.com/make/television/08/MiniRobots.pdf ) http://www.solarbotics.com/products/tr2222/

DS2405 Addressable 1-wire Switch
http://rjconway.homeip.net/wordpress/wp-content/uploads/2008/05/ds2405.pdf

for controlling larger power:
Power Solid State Relay
http://rjconway.homeip.net/wordpress/wp-content/uploads/2008/05/ssr-sc842110.pdf

battery meter:
http://profmason.com/?p=689

mulit chemistry battery charger http://members.shaw.ca/Botgoodies2/MultiCharger/MultiCharger.htm

Addressable Dual Digital Potentiometer - DS1803
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2779/ln/en

Using an Analog Voltage to Control a Digital Potentiometer
http://pdfserv.maxim-ic.com/en/an/AN4051.pdf

Notes on batteries, including notes on Charge Controllers.
http://www.solar-electric.com/deep_cycle_batteries/deep_cycle_battery_faq.htm

http://en.wikipedia.org/wiki/Battery_charger

Notes on battery desulfinator http://screwdecaf.cx/mini-d.html

Generating Electricity with Stepper Motors
http://www.c-realevents.demon.co.uk/steppers/stepmotor.htm

MultiTherm ( gather temp data from multiple Dallas Semiconductor DS18x20 1-Wire® Thermometers
http://www.thebloughs.net/hobbies/electronics/multitherm/

K145 Temperature Monitor Data Logger
http://nashdb.tripod.com/K145.htm

ZOMG Cheap DS1820
http://www.taydaelectronics.com/servlet/the-125/DS18S20-DS1820-1-Wire/Detail

1N4004 - diode/rectifier

Temperature Sensors

LM 35

• http://www.ladyada.net/learn/sensors/tmp36.html
• http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Sensors/TempLM35.html simple wiring with resistor.
• LM35 to ADC from elektor, incomplete local copy.
• http://www.best-microcontroller-projects.com/temperature-recorder.html very good, clear pictures, complete solution.
• Temperature Sensor Setup LM35 take one

ad 7614

http://www.scienceprog.com/analog-devices-digital-temperature-sensor-ad7416/

Multiplexing inputs

From "Everyday practical Electronics" 2001.03

• Use CMOS 4066BE which is a stack of 4 spst switches.
• Might also try 4016BE (4) or 4015BE (8) <-binary control (cool)

Digital voltmeter

Build an Analog Bar Graph Expanded Scale Voltmeter
http://www.stefanv.com/electronics/esv.html

MOSFET versus Optisiloator Triac Driver

just took a bunch of MOSFETs off some old mother boards.

So what's the difference between a MOSFET and an Optoisolator Triac Driver?

A MOSFET can take a small voltage signal and make it large or vica versa, take a large voltage signal and make it small.

not that it might be appropriate to use a different type of MOSFET to convert an analog versus a digital signal.

There are n-type MOSFETs and p-type MOSFET, dunno the diff just yet.

MOSFETs can get complicated as you try to model how well they "translate" signal. an Idea MOSFET translates a signal perfectly, or exactly as you want it to be translated, however in the realworld depending on the configuration and materials, the MOSFET has a certain response to different types of signals such that it's wise to characterize the signal you give it and find a mosfet that's rated for the best response in that range.

Now compare that with an Optoisolating Triac Driver that also might get wired up the same way as a MOSFET, but does a different job. It's meant to protect on curcuit from another.

Here is an example where a doorbell signal controls a camera shutter

http://digital-photography-school.com/how-to-make-a-remote-shutter-release-from-a-doorbell-diy-special

MOCO 3020 Optoisolator Triac Driver - Media:161-12855-0-MOC3010.pdf

the idea I think is that the signal from doorbell is isolated from the shutter control. I play in software alot , so I might liken it to input validation.

You are proecting the delcate camera bits from the door bell bits.

power meter:
http://scriptkiller.de/en/a29/25c3/power_and_energy-meter/

Resistor Guide

So I did some testing with my own multi-meter. I moved the meter's dial from 2000k Ohms, Through 200k, 20k, 2000, all the way to 200 Ohms before I got a reasonable reading from my first resistor. I tested yellow purple gold gold, expecting to get 4.7 Ohms, I got 5.5

• yellow 4
• purple 7
• gold "more the decimal to the left by one.

I test brown green gold gold expecting 1.5 and got 2.5 Ohms. (again with the multi meter dial at 200 Ohms)

• brwon 1
• green 5
• gold "more the decimal to the left by one.

I then tested the multi meter on it's own, simply connecting the two leads and got 0.8, this explains the discrepancies good enough for me.

Next resistor: brown green purple gold ( 1 5 7 ).. I get 151 oms.

I expect 15 0000000 but that can't be right. Violet? Purple? I can't tell, I'm blind.

Next yellow purple black black, 4 7 0 mulitple 0 = 470 Ohms, and that's what I get, SCORE.

brown black brown gold - 1 0 1 = 100 Ohms as meaasured ( dial at 2000 ).

Transistor Guide

Analog to Digital Converters

• 12 channel ADC-box with reinforced electrical isolation by Teunis van Beelen

Low powered data logger

http://www.gedanken.demon.co.uk/temperature-recorder/

Printer Port

• http://www.beyondlogic.org/spp/parallel.htm

Charge controllers

• BUILD A SIMPLE CHARGE CONTROLLER
• /A Simple Charge Controller (local copy)
• http://pcbheaven.com/circuitpages/PC_Fan_Failure_Alarm/
• http://www.reuk.co.uk/Make-a-Simple-Battery-Status-Monitor.htm
• http://www.reuk.co.uk/Light-Dependent-Resistor.htm

See Also

• On Collecting Solar Power and Storing the Power in a battery efficiently
• Alternate Energy Storage Approaches
• /List of pages with list circuits Lists of lists!!!!!
• http://transistor-man.com/intro_to_bascom.html
• http://www.ece.mtu.edu/ee/faculty/gearcher/EElabs/EE3306/resources.html Motorola 68HC-11 resources