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Headers and terminals, 0.1" pitch (2.54mm)

Part Manufacturer PN Digikey PN Image
2-position screw terminal, 0.2" pitch (interlocking, so you can make continuous blocks of any length) EDZ250/2 ED1973-ND ED1973-ND
3-position screw terminal 0.2" pitch (interlocking, so you can make continuous blocks of any length) EDZ250/3 ED1974-ND ED1974-ND
2-position screw terminal 0.1" pitch (not interlocking) OSTVN02A150 ED10561-ND ED10561-ND
3-position screw terminal 0.1" pitch (not interlocking) OSTVN03A150 ED10562-ND ED10562-ND
Header male, breakaway 40-pin 0.1" pitch 4-103185-0 A26513-40-ND A26513-40-ND
Female header 2-position 0.1" pitch PPPC021LFBN-RC S7035-ND S7035-ND
Female header 3-position 0.1" pitch PPPC031LFBN-RC S7036-ND S7036-ND
Female header 4-position 0.1" pitch PPPC041LFBN-RC S7037-ND S7037-ND
Female header 6-position 0.1" PPPC061LFBN-RC S7039-ND S7039-ND
Female header 8-position 0.1" pitch PPPC081LFBN-RC S7041-ND S7041-ND
Female header 10-position 0.1" pitch PPPC101LFBN-RC S7043-ND S7043-ND
Female header 2-position Right Angle 0.1" pitch PPPC021LGBN-RC S5477-ND S5477-ND
Female header 3-position Right Angle 0.1" PPPC031LGBN-RC S5478-ND S5478-ND
Female header 4-position Right Angle 0.1" pitch PPPC041LGBN-RC S5479-ND S5479-ND
Female header 2x3 0.1" pitch PPPC032LFBN-RC S7106-ND S7106-ND
Male header 2x3 0.1" pitch (useful for Arduino ICSP headers) 961206-6404-AR 3M9459-ND 3M9459-ND
Shunt Jumper 0.1" pitch 969102-0000-DA 3M9580-ND 3M9580-ND

Molex KK connectors

For crimping, try searching "SN-28B crimping tool" on Amazon or elsewhere.

Part Manufacturer PN Digikey PN Image
KK-series 2-pin male header with lock tab, 0.1" pitch 0022232021 WM4200-ND WM4200-ND
KK-series 2-pin female free-hanging housing with lock tab, 0.1" pitch 0010112023 WM2601-ND WM2601-ND
KK-series crimp pin for female housing, 24-30 gauge wire 0050291900 WM5269CT-ND WM5269CT-ND

JST connectors

PH-series, 2-mm pin spacing, often found on small Li-Ion batteries

For crimping, try "Engineer PA-09 connector pliers" on Amazon or elsewhere

Part Manufacturer PN Digikey PN Image
JST PH-series 2.0mm male header surface mount, 2-pin B2B-PH-SM4-TB(LF)(SN) 455-1734-6-ND 455-1734-6-ND
JST PH-series 2.0mm male header through hole, 2-pin B2B-PH-K-S(LF)(SN) 455-1704-ND 455-1704-ND
JST PH-series 2.0mm female housing (for attaching to loose wires), 2-pin PHR-2 455-1165-ND 455-1165-ND
JST PH-series 2.0mm male header through hole, 4-pin B4B-PH-K-S(LF)(SN) 455-1706-ND 455-1706-ND
JST PH-series 2.0mm female housing (free hanging), 4-pin PHR-4 455-1164-ND 455-1164-ND
JST PH-series crimp pin 24-30AWG for female housings SPH-002T-P0.5S 455-1127-1-ND 455-1127-1-ND

Buttons (tactile switches)

Part Manufacturer PN Digikey PN Image
Tactile switch, surface mount B3S-1000P SW836CT-ND SW836CT-ND
Tactile switch, through-hole 1825910-6 450-1650-ND 450-1650-ND

Switches

Part Manufacturer PN Digikey PN Image
Slide Switch, surface mount (Copal) CSS-1210TB 563-1091-1-ND 563-1091-1-ND

Battery holders

Part Manufacturer PN Digikey PN Image
CR1220 battery holder, surface mount 3000TR 3000KCT-ND 3000KCT-ND
CR1220 battery holder, through hole 3001 3001K-ND 3001K-ND
CR1632 battery holder, through hole 3013 3013K-ND 3013K-ND

SD card slot

Part Manufacturer PN Digikey PN Image
Micro SD card slot, push-push spring loaded, surface mount with pins in the center of the housing, only barely accessible. 3M 2908-05WB-MG 3M5607CT-ND 3M5607CT-ND
Micro SD card slot, push-push spring loaded, surface mount "reverse mount" with pins easily accessible at rear of housing. Molex 5027740891 WM24066CT-ND WM24066CT-ND

Voltage regulator

Part Manufacturer PN Digikey PN Image
MCP1700 3.3V low dropout linear regulator 250mA through hole MCP1700-3302E/TO MCP1700-3302E/TO-ND MCP1700-3302E/TO-ND
MCP1700 3.3V low dropout linear regulator 250mA surface mount SOT-23-3 MCP1700T-3302E/TT MCP1700T3302ETTCT-ND MCP1700T3302ETTCT-ND
MCP1700 3.0V low dropout linear regulator 250mA surface mount SOT-23-3 MCP1700T-3002E/TT MCP1700T-3002E/TTCT-ND MCP1700T-3002E/TTCT-ND
AP2210N-3.3TRG1 3.3V low dropout linear regulator, 300mA, up to 13.2V input, SOT-23-3 AP2210N-3.3TRG1 AP2210N-3.3TRG1DICT-ND AP2210N-3.3TRG1DICT-ND

AVR chips

Part Manufacturer PN Digikey PN Image
ATmega328P-PN through hole 28-DIP (standard Arduino Uno chip) ATMEGA328P-PN ATMEGA328P-PN-ND ATMEGA328P-PN-ND
ATmega328P-AU surface mount 32TQFP ATMEGA328P-AU ATMEGA328P-AU-ND ATMEGA328P-AU-ND
ATtiny84A surface mount 14-SOIC ATTINY84A-SSUR ATTINY84A-SSURCT-ND ATTINY84A-SSURCT-ND
ATtiny85V surface mount 8-SOIC ATTINY85V-10SUR ATTINY85V-10SURCT-ND ATTINY85V-10SURCT-ND
ATtiny2313A surface mount 20-SOIC ATTINY2313A-SUR ATTINY2313A-SURCT-ND ATTINY2313A-SURCT-ND

IC Socket

Part Manufacturer PN Digikey PN Image
28-DIP socket, appropriate for Arduino ATmega328P DIP version 4828-3004-CP 3M5480-ND 3M5480-ND

Real time clock chips

Part Manufacturer PN Digikey PN Image
DS3231S Real Time Clock surface mount SOIC-16 WIDE DS3231S# DS3231S#-ND DS3231S#-ND
DS3231M Real Time Clock surface mount 8-SOIC (this part is smaller + cheaper than the DS3231S, but slightly lower precision timekeeping and fewer square-wave output frequencies) DS3231MZ/V+ DS3231MZ/V+-ND DS3231MZ/V+-ND

Power plug

Part Manufacturer PN Digikey PN Image
2.1mm center Female plug (plugs in to Arduino DC power connector) PP3-002A CP3-1000-ND CP3-1000-ND
2.1mm center pin Male receptacle (similar to Arduino DC power jack) PJ-202AH CP-202AH-ND CP-202AH-ND

Tools etc.

Part Manufacturer PN Digikey PN Image
Solder, leaded 60/40 0.015" diameter Rosin activated 389261 82-105-ND 82-105-ND
Solder, leaded 60/40 0.024" diameter, Rosin activated 386824 82-104-ND 82-104-ND
Flux pen Rosin Mildly Activated 760089 82-145-ND 82-145-ND
Flux remover pen for Rosin Activated CW9200 CW9200-ND CW9200-ND
Solder paste, leaded, water soluble, 10cc syringe SMD4300AX10T5 SMD4300AX10T5-ND SMD4300AX10T5-ND