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)