OHLC Sensor Candlestick Chart Kit with Arduino Uno + DHT22
Transform Hourly Temperature Data into Financial-Style OHLC Candlestick Charts with Arduino Uno
Every part needed, pre-tested for compatibility, with an AI build companion trained on this exact project. Shipped from Bengaluru in 3-5 days.
This advanced kit transforms a simple temperature sensor into a sophisticated data visualization instrument. You'll build a standalone device that logs hourly open, high, low, and close metrics from the DHT22 sensor, timestamps them with a DS3231 real-time clock, stores the data on a microSD card, and displays live candlestick charts on a 1.8-inch TFT screen. Ideal for physics experiments, environmental monitoring, and undergraduate engineering projects where understanding minute-by-minute variations is critical. No separate power source or PC connection needed once assembled—carry it into a lab, greenhouse, or storage room and watch trend patterns emerge as bullish or bearish candles.
What You'll Build
A portable temperature data logger with a live candlestick chart display. The system captures the highest, lowest, and boundary readings each hour, plots them as classic financial-style candles with color-coded bodies (green for rising, red for falling), and saves raw data in CSV format for later analysis. You'll leave with a fully soldered, battery-powered prototype that can be deployed in real-world experiments—perfect for verifying thermal stability in material testing, mapping classroom temperature swings, or validating HVAC performance.
What You'll Learn
- Interfacing a DHT22 digital sensor with Arduino, applying calibration offsets and error handling to get consistent hourly snapshots
- Configuring a DS3231 RTC module to trigger precise, interrupt-based readings and stamp each data point with accurate time
- Programming the ST7735 TFT display to draw custom OHLC candlesticks—managing pixel-level rendering, wicks, and bullish/bearish colors
- Hand-soldering resistors, capacitors, and breakout boards onto a prototype PCB, then powering the entire system from a 9V battery for untethered operation
Kit Contents
| Component | Quantity |
|---|---|
| Arduino Uno R3 | 1 |
| DHT22 | 1 |
| DS3231 RTC | 1 |
| MicroSD Module | 1 |
| 1.8in TFT ST7735 | 1 |
| 4.7kΩ Resistors | 5 |
| 100nF Capacitors | 5 |
| PCB Prototype Board | 2 |
| 9V Battery Snap | 1 |
| Soldering Iron | 1 |
| Solder Wire | 1 |
Why Buy This Kit Instead of Sourcing Parts Separately
| Factor | Sourcing Separately | Compoden Kit |
|---|---|---|
| Compatibility checks | You verify every part | Pre-tested as a system |
| Build support | Forums and scattered tutorials | AI companion trained on this exact project |
| Time to first working build | Days of debugging | Hours, with step-by-step guidance |
| Shipping coordination | Multiple sellers, multiple delays | One shipment from Bengaluru in 3-5 days |
Who This Kit Is For
Engineering undergraduates in ECE, EEE, or Data Science streams who need a hardware project for semester labs, minor/major submissions, or Smart India Hackathon. Ideal for IIT, NIT, VIT, BITS, and state university students building environmental monitoring or IoT analytics prototypes. Also suits hobbyists exploring financial data visualization techniques with real-world sensor data—no prior knowledge of OHLC charting is required, but familiarity with Arduino and basic soldering will speed up the build.
Built and Backed by Compoden
Every Compoden kit ships with an AI build companion trained on this exact project — accessible via a QR code on the box, with WhatsApp and email backup. We've spent 10 years building projects for makers, schools, and institutions across India. If a part fails because of a manufacturing defect, replace it free within 7 days.
What if I get stuck during the build?
Scan the QR code on the box to launch the AI companion, which walks you through each step with photos, code snippets, and wiring diagrams. If you need more help, message us on WhatsApp—we usually reply within an hour during business hours.
Do I need prior soldering experience?
The kit includes a temperature-controlled soldering iron and the AI companion provides a dedicated soldering crash course for the exact joints you'll make. Most builders with no prior experience complete the assembly in under an hour.
Can I export the data to a computer for analysis?
Yes, the microSD stores a CSV file with timestamps, O, H, L, C, and volume-like metrics. Simply eject the card and open the file in Excel, Google Sheets, or Python for custom statistical analysis.
What experiments benefit from OHLC temperature charts?
Any scenario where rapid temperature changes matter—mapping greenhouse microclimates, testing thermal insulation materials, validating cold chain storage, or correlating classroom ventilation with student comfort. The candlestick format highlights intra-hour volatility that a simple min/max logger would miss.
Hourly open high low close of temperature data rendered as candlestick chart. Trend analysis for experiments.
What's in this kit
Choose your assembly option:
- Soldering Kit — 25W soldering iron, 60/40 solder wire, flux, and small perfboard for permanent assembly.
- Breadboard Combo — 800-point full-size breadboard with 65-piece jumper wire pack for solderless prototyping.
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Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items