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B1What electricity isWater-tank picture of voltage and current, then the same with a battery and bulbOpenB2Volts, amps and ohmsSlide a resistor value and watch the current and the bulb changeOpenB3How a breadboard worksLift the plastic off: the metal strips light up as you touch a holeOpenB4Meet the boardA tour of every part on the Uno-style boardOpenB5Resistors and the colour codeRead the bands, pick the right resistor for an LEDOpenB6LEDsLong leg +, needs a resistor; wire one backwards, then burn one outOpenB7Buttons, switches and knobsPull-up vs floating input; a potentiometer as a dividerOpenB8DiodesA one-way valve, and why the motor needs oneOpenB9CapacitorsCharge and discharge, smoothing, RC timingOpenB10Transistors as switchesA small current controls a big oneOpenB11Motors, and why they need a driverPin current vs motor currentOpenB12Sensors: digital and analog0/1 vs 0–1023OpenB13The multimeterVolts across, amps in series, continuityOpenB14Reading a circuit diagramSymbols, then the same circuit as diagram and as 3DOpenB153.3 V vs 5 V: meet the ESP32Why the ESP32 is different, and what Wi-Fi and Bluetooth addOpen01Blink an LEDA desk in a Yaba tech hubOpen02Shop sign that flashes OPENA barber's kiosk in SurulereOpen03Push-button doorbellA compound gate in IbadanOpen04Dimmer knobA bedside lampOpen05Mix colours with an RGB LEDA mood light for a small roomOpen06Talk over the serial monitorA laptop and a board on a deskOpen07Traffic lightA busy junction in LagosOpen08Queue number on a 7-segment displayA bank hall in AbujaOpen09Reaction-time gameTwo players and one buzzerOpen10Make a sound and play a ringtoneA buzzer that plays a tuneOpen11Streetlight that turns on at duskA street in Port HarcourtOpen12Pepper soup pot thermometerA kitchen in CalabarOpen13Harmattan humidity and heat indexA bedroom in Kano in harmattanOpen14Car reversing sensorA tight parking spot in LekkiOpen15Shop door motion alarmA provision shop at nightOpen16Tilt and shake: phone-drop detectorA phone on a market tableOpen17Sound level meterThe party next doorOpen18Soil moisture for a potted ugu plantA balcony garden in EnuguOpen19Market scale for tomatoesMile 12 market, LagosOpen20Clock with an LCDA shop wall clockOpen21Read a car battery voltageA mechanic's workshop in LadipoOpen22Rechargeable lamp battery meterA rechargeable lamp at homeOpen23NEPA is back! light-up alertA sitting room when the light returnsOpen24Generator fuel gaugeA compound generatorOpen25Generator hour counter for servicingA generator due for its oil changeOpen26Inverter battery monitorA home inverter in AbujaOpen27Voltage guard that cuts the fridge off on surgesA kitchen fridgeOpen28Solar charge trackerA rooftop panel in JosOpen29Phone-charging kiosk timerA roadside charging kioskOpen30Load-shedding scheduler for an inverterA house running on an inverterOpen31Overhead tank level gaugeA rooftop tank in IbadanOpen32Pump that stops when the tank is fullA borehole and an overhead tankOpen33Borehole pump timerA compound boreholeOpen34Leak alarm under the sinkA kitchen sinkOpen35Water vendor's flow meterA water vendor's tank in KanoOpen36Is the water clean? TDS checkA well and a filterOpen37Rain gauge with a tipping bucketA farm weather postOpen38Gutter flood warningA street gutter in the rainy seasonOpen39Rainwater harvest tank switcherA house with two tanksOpen40Water dispenser for a schoolA primary school in OyoOpen41Auto-water a garden bedA vegetable bedOpen42Drip irrigation timerA tomato farm in KadunaOpen43Egg incubator: temperature and turningA poultry farm in OgunOpen44Chick brooder heat lampA brooder penOpen45Fish pond temperature and aeratorA catfish pond in DeltaOpen46Grain store humidity watchA maize store in Niger StateOpen47Tomato cold box with an evaporative fanA tomato seller's cold boxOpen48Bird scarer for a rice fieldA rice field in KebbiOpen49Solar dryer monitorDrying cassava and fishOpen50Poultry feed and water timerA layer penOpen51Control a motorA table fan on a workbenchOpen52Sweep a servoA pointer armOpen53Stepper precision: camera sliderA video set in LagosOpen54Forward and reverse: H-bridge toy carA toy car on a living room floorOpen55Keypad door lockAn office doorOpen56Automatic estate gateAn estate gate in LekkiOpen57Fan that follows the heatA hot afternoon in MaiduguriOpen58Bean sorter by colourSorting beans at a marketOpen59Line-following robotA school robotics clubOpen60Robotic arm: pick and placeA small factory lineOpen61Hello ESP32: your first web page from the boardA phone on the same Wi-FiOpen62Gas cylinder leak alarm with a phone alertA kitchen with a gas cylinderOpen63Generator fumes alarm (carbon monoxide)A house with a generator outsideOpen64Smoke and fire alarm for a market stallA market stall in OnitshaOpen65Gate and shop intruder alert to your phoneA shop gate at nightOpen66Security light at dusk with motionA compound wallOpen67Doorbell that rings your phoneA front doorOpen68Fridge temperature and door alarmA family fridgeOpen69Fall alert for grandmaGrandma's roomOpen70Okada helmet that lights up and signals turnsAn okada rider at nightOpen71Market scale with price and receiptA foodstuff shopOpen72Phone-charging kiosk that bills by the minuteA charging kiosk at a motor parkOpen73Shop prepaid energy meterA row of shops sharing a meterOpen74Pure-water sachet vending machineA school gateOpen75Visitor counter for a shopA shop doorwayOpen76Queue ticket and caller for a clinicA clinic waiting roomOpen77Pill reminder for grandma's medicineGrandma's bedsideOpen78Clinic vaccine fridge monitorA rural health centreOpen79Keke and danfo trackerA keke on its routeOpen80Bus stop arrival boardA BRT stop in LagosOpen81Phone control over BluetoothA phone and a lampOpen82Live sensor dashboard in the browserA dashboard on a phoneOpen83SMS alert with no data (GSM)A farm with no internetOpen84Two boards talk without a router (ESP-NOW)A gate and a houseOpen85Long-range radio, village to village (LoRa)Two villages in PlateauOpen86Data logger to SD cardA week of weatherOpen87Clock from the internet (NTP)A clock that sets itselfOpen88Infrared remote for the TV and ACA living roomOpen89Update the board over Wi-FiA board up on a poleOpen90Mesh of farm sensorsA cashew farm in KogiOpen91Smart water: tank, pump and phoneA house in IbadanOpen92Smart farm: soil, weather, irrigation and SMSA farm near ZariaOpen93Solar home kit: panel, battery and loadsA house off the gridOpen94Shop security systemA shop on a busy streetOpen95Community weather stationA school roofOpen96Mini solar grid for a village kioskA village kioskOpen97Smart bin for a street cornerA street corner in YabaOpen98Roadside air quality monitorA busy road in LagosOpen99Afrobeats beat boxA bedroom studioOpen100Your own inventionA blank bench with every partOpen