Contact person: Business Client

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Location: Finland, Finland

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Job Title: IoT Button Developer – Telegram Notifications (Assembled or DIY Guide)

Project Overview:
We need a skilled developer to design a low-power, battery-powered IoT button that sends messages to a Telegram group when pressed. The device must:

- Operate on battery with ~6 months runtime
- Be housed in a small, simple enclosure
- Either be delivered fully assembled, or come with clear, step-by-step assembly instructions
- Use low-power design to achieve long battery life
- Send messages reliably via Telegram Bot API

ESP32 is an option, but other low-power microcontrollers or IoT boards are acceptable if they offer advantages.

Scope of Work:
Hardware & Assembly:

* Select appropriate microcontroller/board (ESP32 or alternative)
* Select battery solution to meet ~6-month life target
* Design or select small, compact enclosure
* Either:

* Assemble fully working devices, or
* Provide a complete, easy-to-follow assembly guide with diagrams and part list

Firmware & Connectivity:

* Program device to detect button presses
* Implement ultra-low-power operation (deep sleep or equivalent)
* Connect to Wi-Fi (or other network method)
* Send messages to a Telegram group via Telegram Bot

Testing & Documentation:

* Test device end-to-end (button → Telegram message)
* Provide source code and build instructions
* Provide assembly guide or instructions for configuring Wi-Fi and Telegram Bot

Requirements:

* Experience with embedded systems / IoT devices
* Experience with low-power microcontrollers (ESP32, nRF52, STM32L0, etc.)
* Experience with battery-powered designs and long-life optimization
* Experience with Telegram Bot API
* Ability to provide clean, documented code and hardware assembly instructions

Deliverables:

1. Either:

* Fully assembled device(s) ready to use
* OR complete assembly guide with diagrams, part list, and instructions
2. Wiring diagram / schematic
3. Device source code and build files
4. Telegram bot integration instructions (Bot setup + provisioning)
5. Optional: recommendations for future production runs

How to Apply:

* Examples of previous hardware + firmware IoT builds
* Photos of assembled devices you’ve made or assembly guides you’ve written
* Proposed microcontroller / battery / enclosure choice
* Questions about required features

Notes:

* Open to alternative low-power architectures if they meet battery longevity requirements
* Assembly guide must be detailed enough for non-experts to follow if devices are not pre-assembled" (client-provided description)