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Circuit & SPARK, DOWNTOWN, St. John's, Newfoundland and Labrador, NL (2026)

04/29/2026

⚡ CIRCUIT & SPARK — COMPONENT INVENTORY ⚡
Local Electronics Parts – Updated Availability List

💻MICROCONTROLLERS:

Digispark ATtiny85 Microcontroller
→ $5 EACH!
ESP32-S3-WROOM-1 (Unsoldered Module)
→ $10.00 each

🌡️ TEMPERATURE & ENVIRONMENTAL SENSORS:

DHT11 Temperature & Humidity Sensor
→ $2.00 each • 3 for $5.00
DHT22 Temperature & Humidity Sensor
→ $3.00 each • 2 for $5.00
Water Detection Sensor Module
→ 5 for $5.00 • 12 for $10.00
Flame Detection Sensor Module
→ 5 for $5.00
MQ-2 Gas Sensor (Smoke/LPG Detection)
→ $5.00 each
MQ-135 Air Quality Sensor
→ $5.00 each

📡 MOTION, POSITION & OBJECT DETECTION:

HC-SR04 Ultrasonic Distance Sensor
→ $3.00 each • 2 for $5.00
IR Object Detection Sensor Module
→ 5 for $5.00 • 12 for $10.00
RCWL-0516 Microwave Radar Motion Sensor
→ 3 for $5.00
MPU-6500 6-Axis IMU (Gyro + Accelerometer)
→ $4.00 each

📶 WIRELESS, GPS & RF MODULES:

NEO-6M GPS Module (u.FL Antenna)
→ $5.00 each
NEO-7M GPS Module (Onboard Antenna + SMA + Micro-USB)
→ $8.00 each
NEO-8M GPS Module (Onboard Antenna + SMA + Micro-USB)
→ $12.00 each
NRF24L01 2.4GHz Wireless Module
→ $3.00 each
NRF24L01 + PA + LNA (Long Range Version)
→ $5.00 each • 2 for $8.00
CC1101 Sub-GHz RF Module
→ $6.00 each • 2 for $10.00
HT-RA62 915MHz LoRa Module (u.FL Connector)
→ $10.00 each • 2 for $15.00

🖥️ DISPLAYS & INPUT:

2.0" TFT SPI Color Display (240×320)
→ $8.00 (Currently Sold Out)
2.8" TFT Touchscreen Display (SPI + SD Slot + Stylus)
→ $15.00 (Currently Sold Out)
16-Key Matrix Button Keypad (DIY Module, Green PCB)
→ 5 for $10.00 OR $2.00 EACH!

🔌 POWER, CHARGING & CABLES:

USB-C to USB-C Cable (1m, 100W Fast Charge)
→ $3.00 EACH!
USB-C to USB-A Cable (1m, 60W Fast Charge)
→ $3.00 EACH!
TP4056 Li-Ion Charging Module (Micro-USB)
→ 3 for $5.00

🧰 PROTOTYPING & COMPONENTS:

Mini 170-Point Breadboard (Red/White)
→ $2.00 each
16-Channel Analog Multiplexer Module
→ 3 for $5.00
2N2222 NPN Transistors
→ 10 for $2.50

📍 Based in St. John’s, NL
📦 Local Pickup

NEW INVENTORY COMING SOON!

04/27/2026

👉 QR CODE FOR MY PAGE 👈

04/27/2026

🔥 4x4 Matrix Keypad Module – 16 Button Input (Arduino / ESP32 Compatible) 🔥

🔸 Build your own keypad system with this awesome 16-button matrix module! 🔸

Whether you're creating a DIY door lock, game controller, macro pad, or even a mini synth controller—this little board gets it done.

It uses a smart matrix layout so you can control all 16 buttons with fewer pins, making it ideal for projects where GPIO is limited. Just hook it up to your Arduino or ESP32 and start coding your own custom controls.

𝗔𝘄𝗲𝘀𝗼𝗺𝗲 𝗳𝗼𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗹𝗶𝗸𝗲:
🔸 Password/keypad entry systems
🔸 Home automation panels
🔸 Custom gaming controllers
🔸 Macro pads / shortcut boards
Interactive displays

⚙️ Easy to use, compact design, and very responsive tactile buttons.

💰𝗗𝗲𝗮𝗹: 𝟱 𝗳𝗼𝗿 $𝟭𝟬 OR $2.00 EACH!💰

Grab a few for your next build!

04/26/2026

👉 𝗕𝗿𝗮𝗻𝗱 𝗻𝗲𝘄 𝗛𝗧-𝗥𝗔𝟲𝟮 𝟵𝟭𝟱𝗺𝗵𝘇 𝗟𝗼𝗥𝗮 𝘄𝗶𝗿𝗲𝗹𝗲𝘀𝘀 𝗺𝗼𝗱𝘂𝗹𝗲𝘀 𝗻𝗼𝘄 𝗮𝘃𝗮𝗶𝗹𝗮𝗯𝗹𝗲 — 𝗠𝗘𝗦𝗛𝗧𝗔𝗦𝗧𝗜𝗖 𝗖𝗢𝗠𝗣𝗔𝗧𝗜𝗕𝗟𝗘! 👈

ᴛʜᴇsᴇ ᴄᴏᴍᴘᴀᴄᴛ, ʜɪɢʜ-ᴘᴇʀꜰᴏʀᴍᴀɴᴄᴇ ᴍᴏᴅᴜʟᴇs ᴀʀᴇ ᴘᴇʀꜰᴇᴄᴛ ꜰᴏʀ ᴍɪᴄʀᴏᴄᴏɴᴛʀᴏʟʟᴇʀ ᴘʀᴏᴊᴇᴄᴛs ɪɴᴄʟᴜᴅɪɴɢ ᴇsᴘ³², ᴀʀᴅᴜɪɴᴏ, sᴛᴍ³², ʀᴀsᴘʙᴇʀʀʏ ᴘɪ ᴘɪᴄᴏ, ᴄᴜsᴛᴏᴍ sᴇɴsᴏʀ ɴᴇᴛᴡᴏʀᴋs, ʀᴇᴍᴏᴛᴇ ᴍᴏɴɪᴛᴏʀɪɴɢ, ᴀᴜᴛᴏᴍᴀᴛɪᴏɴ, ᴀɴᴅ ᴇsᴘᴇᴄɪᴀʟʟʏ ᴍᴇsʜᴛᴀsᴛɪᴄ-sᴛʏʟᴇ ʙᴜɪʟᴅs.

ʙᴜɪʟᴛ ᴀʀᴏᴜɴᴅ ᴛʜᴇ ʀᴇsᴘᴇᴄᴛᴇᴅ sᴇᴍᴛᴇᴄʜ sx¹²⁶² ʟᴏʀᴀ ᴛʀᴀɴsᴄᴇɪᴠᴇʀ, ᴛʜᴇʏ ᴅᴇʟɪᴠᴇʀ ᴇxᴄᴇʟʟᴇɴᴛ ʟᴏɴɢ-ʀᴀɴɢᴇ ᴘᴇʀꜰᴏʀᴍᴀɴᴄᴇ, ᴠᴇʀʏ ʟᴏᴡ ᴘᴏᴡᴇʀ ᴄᴏɴsᴜᴍᴘᴛɪᴏɴ, ᴀɴᴅ ʀᴇʟɪᴀʙʟᴇ sᴜʙ-ɢʜᴢ ᴄᴏᴍᴍᴜɴɪᴄᴀᴛɪᴏɴ.

𝗞𝗲𝘆 𝗦𝗽𝗲𝗰𝘀 & 𝗙𝗲𝗮𝘁𝘂𝗿𝗲𝘀:
• 915 MHz version (supports US915, AU915, and 902–928 MHz bands)
• Transmit power up to +22 dBm
Receive sensitivity down to -139 dBm (mode dependent)
• SPI interface – works seamlessly with ESP32, Arduino, STM32, RP2040/Pico, nRF52, and more
• 3.3V operation with low-power sleep modes
Ultra-compact size: approx. 16 x 17 x 0.8 mm with castellated edges for easy soldering
U.FL / IPEX antenna connector for flexible antenna options

𝗪𝗵𝘆 𝘁𝗵𝗲𝘆 𝘀𝘁𝗮𝗻𝗱 𝗼𝘂𝘁:
• Outstanding range: 1–5 km urban, 5–15 km suburban, 15+ km in rural/open areas (even farther with line-of-sight)
• Excellent interference resistance – great where Wi-Fi or Bluetooth falls short
Ideal for battery-powered sensor nodes and mesh networking
• Supports LoRa, FSK, and other modulations
MESHTASTIC COMPATIBLE – excellent for off-grid text messaging, GPS position sharing, mesh relaying, emergency communications, hiking/camping comms, and community mesh networks when paired with ESP32, nRF52, or STM32
• Great for remote sensors, farm monitoring, smart gates, weather stations, vehicle telemetry, repeaters, wilderness comms, and off-grid projects.

𝙈𝙚𝙨𝙨𝙖𝙜𝙚 𝙞𝙛 𝙞𝙣𝙩𝙚𝙧𝙚𝙨𝙩𝙚𝙙 — 𝙢𝙪𝙡𝙩𝙞𝙥𝙡𝙚 𝙪𝙣𝙞𝙩𝙨 𝙖𝙫𝙖𝙞𝙡𝙖𝙗𝙡𝙚.
$𝟭𝟬 𝙚𝙖𝙘𝙝 𝙤𝙧 𝟮 𝙛𝙤𝙧 $𝟭𝟱!

04/26/2026

🔌 USB-C Fast Charging Cables – Available Now

📦 AVAILABLE CABLES:

1️⃣ USB-C to USB-C 1 Meter Fast Charging Cable – $3 EACH!

📊 DETAILS & USE CASES:

🔹 1️⃣ USB-C to USB-C Fast Charging Cable
High-speed charging and data transfer for modern devices.
✔ Supports fast charging (PD compatible devices)
✔ Durable 1-meter length – ideal for everyday use
✔ Works with phones, tablets, ESP32 dev boards, power banks, and more

📍 Local pickup available
📩 Message me with item number + quantity
📸 Photos correspond to item numbers above

04/26/2026

ESP32 / Arduino Display Modules – Available Now

📦 𝗔𝗩𝗔𝗜𝗟𝗔𝗕𝗟𝗘 𝗠𝗢𝗗𝗨𝗟𝗘𝗦:
1️⃣ 2.0” TFT SPI Display (7-Pin) - $𝟖 𝐄𝐀𝐂𝐇
2️⃣ 2.8” TFT SPI Touchscreen Display (14-Pin + SD Slot) - $𝟏𝟓 𝐄𝐀𝐂𝐇

📊
🔹 1️⃣ 2.0” TFT Display
Compact full-color display for UI and data visualization.
✔ 240x320 resolution
✔ SPI interface (fast updates)
✔ Great for dashboards, menus, sensor data

🔹 2️⃣ 2.8” TFT Touchscreen Display
Larger interactive display with touch control.
✔ Resistive touchscreen (stylus + finger)
✔ Built-in SD card slot
✔ Perfect for control panels, smart home dashboards, GUIs

📍 Local pickup available
📩 Message me with item number + quantity

📸 Photos correspond to item numbers above

04/26/2026

🔧 ESP32 / Arduino Power & Prototyping Components – Available Now

Working on a project build? These essential components make prototyping, powering, and testing your circuits quick and easy.

Perfect for ESP32, Arduino, Raspberry Pi, and electronics projects of all kinds.

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📦 AVAILABLE COMPONENTS:

1️⃣ Mini 170-Pin Breadboard (Red/White) – $2 each
2️⃣ TP4056 Micro-USB Lithium Battery Charging Module – 3 for $5

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📊 DETAILS & USE CASES:

🔹 1️⃣ Mini 170-Pin Breadboard
Compact solderless breadboard for quick prototyping.
✔ No soldering required
✔ Interlocking design (expandable)
✔ Peel-off adhesive backing
✔ Perfect for testing circuits and small builds

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🔹 2️⃣ TP4056 Charging Module
Micro-USB charger for 3.7V lithium batteries.
✔ Built-in charging management
✔ Overcharge & discharge protection (on most versions)
✔ Ideal for battery-powered ESP32/Arduino projects
✔ Great for portable electronics builds

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📍 Local pickup available
📩 Message me with item number + quantity
💬 Bundle deals available when buying multiple items

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📸 Photos correspond to item numbers above

04/26/2026

🔧 ESP32 / Arduino Wireless & Communication Modules – Available Now

Need wireless communication, long-range data transfer, or GPS positioning?
These modules are perfect for IoT, remote monitoring, robotics, and tracking projects.

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📦 AVAILABLE MODULES:

1️⃣ NRF24L01 2.4GHz Wireless Module – $3 each
2️⃣ NRF24L01 + PA + LNA Long Range Module (with antenna) – 2 for $8
3️⃣ NEO-6M GPS Module (with antenna) – $5 each
4️⃣ NEO-7M GPS Module – $8 each
5️⃣ NEO-8M GPS Module – $12 each

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📊 DETAILS & USE CASES:

🔹 1️⃣ NRF24L01 Wireless Module
Low-power 2.4GHz communication module.
✔ Great for wireless sensor networks
✔ Fast data transmission between microcontrollers
✔ Ideal for IoT and remote control projects

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🔹 2️⃣ NRF24L01 + PA + LNA Module
Extended range version with external antenna.
✔ Much longer communication distance
✔ More stable signal in larger areas
✔ Perfect for outdoor and long-range setups

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🔹 3️⃣ NEO-6M GPS Module
Reliable and affordable GPS positioning module.
✔ Includes antenna
✔ Provides latitude, longitude, speed, and time
✔ Great for tracking and navigation projects

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🔹 4️⃣ NEO-7M GPS Module
Improved performance over NEO-6M.
✔ Faster satellite lock
✔ Better signal sensitivity
✔ Ideal for more accurate positioning

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🔹 5️⃣ NEO-8M GPS Module
High-performance GPS module.
✔ Faster and more precise than previous versions
✔ Better accuracy in challenging environments
✔ Great for advanced tracking systems

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📍 Local pickup available
📩 Message me with item number + quantity
💬 Bundle deals available for multiple items

---

📸 Photos correspond to item numbers above

04/26/2026

🔧 ESP32 / Arduino Motion & Detection Sensors – Available Now
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📦 AVAILABLE SENSORS:

1️⃣ IR Obstacle Detection Sensor Module – 5 for $5 or 12 for $10
2️⃣ RCWL-0516 Microwave Motion Sensor – 3 for $5
3️⃣ Flame Detection Sensor Module – 3 for $5
4️⃣ HC-SR04 Ultrasonic Distance Sensor – $3 each or 2 for $5

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📊 DETAILS & USE CASES:

🔹 1️⃣ IR Obstacle Detection Sensor
Detects nearby objects using infrared light.
✔ Adjustable sensitivity
✔ Fast response time
✔ Great for robotics and obstacle avoidance

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🔹 2️⃣ RCWL-0516 Radar Motion Sensor
Microwave-based motion detection through materials.
✔ Detects movement through plastic, glass, thin walls
✔ Wider detection range than PIR
✔ Ideal for hidden motion sensing and automation

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🔹 3️⃣ Flame Detection Sensor
Detects fire sources and infrared flame signals.
✔ Adjustable detection sensitivity
✔ Digital + analog output
✔ Useful for fire alarm or safety projects

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🔹 4️⃣ HC-SR04 Ultrasonic Sensor
Measures distance using sound waves.
✔ Range: ~2cm to 400cm
✔ High accuracy distance measurement
✔ Perfect for tank levels, parking sensors, robotics

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📍 Local pickup available
📩 Message me with item number + quantity
💬 Bundle deals available on multiple items

---

📸 Photos correspond to item numbers above

04/26/2026

🔧 ESP32 / Arduino Temperature & Environmental Sensors – Available Now

📦 AVAILABLE SENSORS:

1️⃣ DHT11 Temperature & Humidity Sensor – $2 each or 3 for $5
2️⃣ DHT22 Temperature & Humidity Sensor – $3 each or 2 for $5
3️⃣ MQ-2 Gas Sensor Module – $5 each
4️⃣ MQ-135 Air Quality Sensor Module – $5 each
5️⃣ Analog Water Detection Sensor Module (3-pin) – 5 for $5 or 12 for $10

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📊 DETAILS & USE CASES:

🔹 1️⃣ DHT11 Sensor
Basic and affordable temperature & humidity sensor.
✔ 0–50°C temperature range
✔ 20–80% humidity range
✔ Great for beginner projects and simple monitoring

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🔹 2️⃣ DHT22 Sensor
Higher accuracy and wider range than DHT11.
✔ -40 to 80°C
✔ 0–100% humidity
✔ Ideal for weather stations and IoT systems

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🔹 3️⃣ MQ-2 Gas Sensor
Detects flammable gases and smoke.
✔ Sensitive to LPG, propane, methane, hydrogen
✔ Adjustable sensitivity
✔ Perfect for gas leak and safety projects

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🔹 4️⃣ MQ-135 Air Quality Sensor
Monitors overall air quality and harmful gases.
✔ Detects ammonia, benzene, smoke, CO₂ trends
✔ Great for indoor air monitoring systems
✔ Useful in smart home setups

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🔹 5️⃣ Water Detection Sensor
Simple and effective liquid detection module.
✔ Detects water presence or leaks
✔ Ideal for flood alerts, tank monitoring
✔ Works great in automation projects

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📍 Local pickup available
📩 Message me with item number + quantity

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📸 Photos correspond to item numbers above

Circuit & SPARK

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