General Projects

DS1620 temperature IC.. Have several chips and they look easy to use
 https://rubenlaguna.com/post/2008-08-31-arduino-and-ds1620-digital-temperature-sensor/


Also have about 20 X AT Tiny15. No RAM but have everything else including MOSI etc for programming. Try to program them with USBAsp programmer in breadboard.
C:\Users\Dell\Documents\documents

Have a PonyProg (kind of) programmer from Olmix  Might be useful for old At Tinys etc.Check it out with ATTiny15. Link to programmer is here .. But wait Connects to PC via RS232 port (note it will not work with USB-RS232 converters!) Pity.

And we have the Freetronics sound and buzzer module that will detect knocks as well. As well is this Piezo element.

The shift register 74hc595 Some details here how to work with Arduino.

Texas Instruments SN7497N, Multiplier, 16-Pin PDIP

74LS367 - Hex Bus Driver  XOR IC 74LS86

74HC14 Hex Inverting Schmitt Trigger

Demultiplexer - 74HC138 (Arduino Compatible)

Drawing on 8x32 LED matrix with 74HC154

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I2C not working with 74HC151 multiplexer (EDIT: Trying with SoftI2C.h now)

Run two Arduinos from same PC. Use two instances of IDE.

AVR Butterfly. Smiley has good pages . Also have 1 butterfly in pristine packet and another screwed into blue plastic basket with serial connections available.

and 6 x Mega8515 (must have been cheap).

How about the Freetronics Ether ten. It has ethernet connection and sd card.

Use the GPRS Shield V2.0 from seeduino.

Servo - Generic (Sub-Micro Size) Use a microservo

ccHave kit of freetronics Arduino with motor drive and big wheel driven by motor. SparkFun Motor Driver - Dual TB6612FNG (1A)

and IIC EEPROM 24LC256 etc 
and how about a shaftess vibration motor (little buzzer)

Cheap communication with 433MHz radio modules

Check out this video and plan a project based on environmental sampling following by transmission of data to distant Arduino logger. Can you do two way, half duplex communication that's time stamped too.

Soil temperature

We need an intelligent ball we can bury in the ground. It monitors soil temperature over several weeks.
When we dig it up we can read off the time-stamped temperatures and graph them, An advanced model would send a radio signal above the ground for a receiver to capture. It could even be two way so that we could wake up the buried module to give us a burst of data.
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Unlike this sensor, we need to take our power supply underground.

Make and calibrate your own salinity meter.

Check out this site  and make your own calibrated salinity meter. Use for soil samples and for river water.

Measure temperature of Kaikorai Stream over time.

Make up a waterproof river temperature probe that will log water temperatures along with times tamping them.

One configuration would be :
Arduino in secure box
Temperature sensor eg the TMP36 that comes in our kit.
Real time clock (several options including this cheap one)
Somewhere to stire data. Maybe SD card; maybe using the Arduino's spare flash memory.

Experimenting with LoRa

Set up two LoRa stations and communicate simple messages.