Overview

Havaxer™ 01 is a multiple-inputs-and-outputs-of-different-kinds controller board (PCB) that allows various functions.

It is based on a robust Microchip's PIC platform. Any compatible 20-pin DIP PIC MCU can be inserted into the socket.

01 can be optionally fitted with an OLED. It has built-in two buttons, and an eBUS adapter wired via an UART interface.

It was originally designed to control a complete HVAC system with one heating/cooling circuit.

The PIC MCU is not included in the board. But the powerful PIC18F16Q40 can be additionally ordered with the board, though. If so, it comes pre-programmed with my example application for demonstration and testing purposes only. Otherwise you have to choose your own PIC, write your own application and program the PIC by yourself.

There is no safety enclosure for the board and thus no physical protection, yet. You can install it in other enclosure, be it provisional or electrical, or inside other device, like a heat pump. You can also hang it on the wall and just be very careful around it.

Status

Version 1.0

In PCB diagram PDF you can find a complete and very transparent layout of the PCB, which, when printed on a paper, gets you a precise size and dimensions, too.

Next is a rendered 2D PCB with all components. Note that colors might not be correct.

Next is a rendered 3D PCB with all components. Note that colors might not be correct.

Specifications

The board is an industrial/consumer electronics manufactured PCB:

• FR-4, lead-free, green
• 4 layers, 1.6 mm thick
• 143 mm x 160 mm
• height approx. 20 mm
• weight approx. 154 g

Connections:

• PIC MCU socket (20-pin, DIP)
• PICkit ICSP header
• UART, PICkit compatible header (3.3 V)
• eBUS adapter (24 V) to UART
• I2C display header (3.3 V)
• I2C QWIIC connector
• USB-C connector (power only)
• alternative power supply terminal (7-33 V)

Inputs:

• 5x analog temperature sensor (NTC 10k)
• 1x mains optocoupler (250 VAC)

Outputs:

• 3x mechanical relay (250 VAC, 10 A)
• 2x solid state relay - triac (220 VAC, 1.2 A)
• 1x driver (5 VDC, 100 mA)

Pricing, Order

Prior shipping, each board is inspected and tested. If optional items are ordered, they are also inspected, tested and attached to the board.

VAT is included.

Shipping is possible only inside the European Union.

Statements

Terms of Sale & Buyer Eligibility

1. Restricted to Professional & Technical Users

This product is intended exclusively for professional users, businesses, or technically skilled individuals with sufficient expertise in electronics. It is not intended for general consumer use.

2. Compliance and Certification Notice

By purchasing this product, you acknowledge and agree that this item:

• Does not comply with standard consumer product regulations.
• Is not certified by regulatory bodies (e.g., it lacks CE, FCC, or UL markings).
• Requires advanced knowledge, assembly, integration, testing, and the implementation of appropriate safety measures by the buyer.

3. Buyer Responsibility

Buyers acknowledge that they possess the necessary technical knowledge to safely use, evaluate, and integrate the product. You accept full responsibility for verifying its suitability and ensuring compliance for your intended setup.

Liability Disclaimer & Safety Warning

⚠️ WARNING: HIGH VOLTAGE RISK

This product is designed to connect to and control high-voltage mains electricity via its onboard components. Mains electricity can cause severe personal injury, permanent disability, electrocution, fatal electrical shock, or property fire if handled incorrectly.

1. "As-Is" Status & No Warranties

This product is provided strictly on an "as-is" basis. The Seller makes no warranties, express or implied, regarding its safety, reliability, or fitness for any particular high-voltage application.

2. Absolute Assumption of Risk

By handling, installing, or interfacing this product with mains voltage, you assume all inherent risks. You are entirely responsible for implementing physical enclosures, proper insulation, fusing, and grounding to ensure safe operation.

3. Complete Exclusion of Liability

In no event shall the Seller be held liable for any direct, indirect, incidental, or consequential damages. This includes, but is not limited to, bodily injury, death, property damage, loss of home, or equipment failure resulting from the connection, use, misuse, or failure of this product.

4. Maximum Remedy

The Seller's total liability for any claims or damages arising from this purchase shall not exceed the actual purchase price paid for the product.

Examples

This theoretical example shows what the Havaxer 01 was designed for.