Mini 2-wire Volt Meter (2.7 - 40 VDC)
Self-powered 3-digit 7-segment DC voltmeter measuring 2.7–40V with 0.1V precision, drawing 3–4mA. Connect the two wires across the supply to be measured; includes panel-mount tabs.
Start wiring
3.3 V · 5 V
Adafruit lists its single-cell LiPo and Li-ion packs as 3.7 V nominal, with output reaching 4.2 V when fully charged.
Batteries
103 other options9V alkaline cells, CR2032 coin cells, 3.7V LiPo packs (1000–1200mAh), 7.4V 2S LiPo, 18650 Li-ion holders (1–6 cells), AA/AAA holders in every configuration, and snap leads with barrel adapters.
1-Way 18650 Battery Holder visual preview1-Way 18650 Battery Holder
18650 Battery Holder Case - 2 Slot with Switch visual preview18650 Battery Holder Case - 2 Slot with Switch
18650 Battery Holder Case - 4 Slot visual preview18650 Battery Holder Case - 4 Slot
18650 Battery Protection Module (12V 10A) visual preview18650 Battery Protection Module (12V 10A)
2 x 18650 Battery Holder with DC2.1 Power Jack visual preview2 x 18650 Battery Holder with DC2.1 Power Jack
2 x AA Battery Holder with Knife Switch visual preview2 x AA Battery Holder with Knife Switch
2 x AA Battery Holder with On/Off Switch & JST PH Connector visual preview2 x AA Battery Holder with On/Off Switch & JST PH Connector
2 x AA Open Battery Holder with JST PH Connector visual preview2 x AA Open Battery Holder with JST PH Connector
2 x AAA Battery Holder with On/Off Switch & JST PH Connector visual preview2 x AAA Battery Holder with On/Off Switch & JST PH Connector
2 x AAA Battery Holder with Switch visual preview2 x AAA Battery Holder with Switch
2 x AAA Open Battery Holder with JST PH Connector visual preview2 x AAA Open Battery Holder with JST PH Connector
2 x CR2032 Coin Cell Battery Holder - 6V output - On/Off switch visual preview2 x CR2032 Coin Cell Battery Holder - 6V output - On/Off switch
Related groups
4 groups
7.4V Lipo Battery Charger visual previewCharging
Single-cell LiPo chargers (TP4056, MicroUSB/Type-C modules), charger/booster combos (PowerBoost 500/1000, Lipo Rider Plus 5V/2.4A), I2C fuel gauges (MAX17048, LC709203F) and Qi wireless charging coils.
Power · Chargers & fuel gauges · 47 parts
10W 4 USB Power Adapter visual previewPower supplies
Wall adapters (5V–24V), adjustable and fixed buck/boost/buck-boost converters (MT3608, LM2596-class), USB-C PD triggers (HUSB238), breadboard supplies, DIN-rail units and passive barrel-jack adapters.
Power · Supplies & regulators · 147 parts
3.8 / 1.3mm or 3.5 / 1.1mm to 5.5 / 2.1mm DC Jack Adapter Cable visual previewSolar
Solar panels from 1.5V 250mA flexible film to 18V 10W polysilicon, MPPT solar power managers (DFRobot 5V and 9V/12V/18V, Waveshare 6V–24V), bq25185 charger boards and LTC3588 energy-harvesting breakouts.
Power · Solar power · 28 parts
1.75mm PLA (1kg) - Black visual preview3D printing
DFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.
Tools & prototyping · 3D printing · 53 parts