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Products: every Midon Design kit, from TEMP05 to RS232Relay
Midon Design built a compact family of serial interfaces, loggers, relay boards and programmers around the Dallas/Maxim 1-Wire bus and the Motorola 68HC705 microcontroller. This catalogue lists each kit with a one-line summary, shows how it connected to a host computer, and places it in the company's timeline so the individual reference pages are easy to find.
First published May 16, 2007 · Text rewritten 2026
How the kit line fits together
Midon Design started in 1999 with a simple aim: offer home automation and electronics hobbyists small quantities of hardware that larger companies were not interested in making. Most of the kits share one idea. A small microcontroller takes over the precise timing that the 1-Wire bus demands, and the host computer only has to read and write plain text over a serial port. That split made the boards usable from almost any operating system and from home automation packages such as HomeSeer.
The line grew in layers. The first layer was the TEMP05, a serial interface that logged a weather station and a string of thermometers. The second generation, TEMP08, kept the same serial approach and added a real-time clock, an RJ-12 jack, option settings stored in memory instead of jumpers, and support for many more sensor families. Around those two interfaces the company added loggers that could run without a PC, a dedicated interface for switch and input devices, relay outputs, and a stand-alone relay board.
A second strand had nothing to do with 1-Wire. Because several kits ran on the Motorola 68HC705C8, the company published a programmer for that chip, together with DOS software. Two further projects, an infrared interface for the PC parallel port and an X-10 status display, round out the catalogue. Every kit is now discontinued; the company stopped selling at the end of 2023. For the full company history, see the history of Midon Design.
The kits at a glance
Each card below opens the reference page for one kit. The pages describe what the hardware did, which sensors it understood, how it was wired and configured, and what its firmware commands looked like. The TEMP08 has the deepest set of pages, including instructions, software notes, a FAQ and a HomeSeer setup walkthrough, because it was the most widely used board in the line.
TEMP05
The original serial 1-Wire weather station interface, reading up to 60 devices.
TEMP08
The next-generation serial interface with a clock, RJ-12 jack and wide sensor support.
LOG08
A logger that stored time-stamped sensor samples for later download over serial.
LOG08-II
The second-generation logger, built on TEMP08 and able to log 24 sensors.
1WSwitch
A serial interface dedicated to 1-Wire switches and input/output sensors.
1WIO
A DS2408-based module for relays, opto-isolated inputs or LED displays.
RELAY05
Eight DPDT relays driven from TEMP05 or TEMP08 or any TTL source.
RS232Relay
Four Form C relays controlled directly from a PC serial port.
PROG05
A programmer for the Motorola 68HC705C8 used in several Midon kits.
68HC705 programmer
A programmer build for the same chip, with construction and testing notes.
CIR-II
A parallel-port infrared interface for controlling A/V equipment from a PC.
STATX10
An LED display showing the state of eight X-10 unit codes.
Sensors
Temperature, I/O, EEPROM, current and humidity parts sold for the interfaces.
Comparison by host link, function and era
The table sorts the catalogue by the way each kit reached a host and by where it sits in the timeline. "Final catalog" marks the items still offered in the company's last product listing; the rest had already been withdrawn. Two dates are firm: TEMP05 production ended on June 30, 2003, and STATX10 was withdrawn on August 30, 2003.
| Kit | Host link | Function | Era |
|---|---|---|---|
| TEMP05 | RS232 serial | 1-Wire interface and logger for weather sensors and thermometers | Early line; production ended June 30, 2003 |
| TEMP08 | RS232 serial | Second-generation 1-Wire interface with real-time clock and wide sensor support | Final catalog, sold until 2023 |
| LOG08 | RS232 serial | Stand-alone 1-Wire sample logger based on TEMP05 features | Discontinued, replaced by LOG08-II |
| LOG08-II | RS232 serial | Stand-alone logger for up to 24 of 60 attached sensors | Discontinued |
| 1WSwitch | RS232 serial | Interface for 1-Wire switch and I/O devices (DS2405, DS2406, DS2407, DS2408) | Discontinued |
| 1WIO | 1-Wire bus | DS2408 module with relay, opto-isolated input or LED options | Discontinued |
| RELAY05 | TTL lines from TEMP05/TEMP08 | Eight DPDT relays driven by TTL signals | Discontinued |
| RS232Relay | RS232 serial or USB adapter | Four Form C relays with momentary, pulsed or steady operation | Final catalog, sold until 2023 |
| PROG05 | RS232 serial | Programmer for the Motorola 68HC705C8 and C8A | Discontinued |
| 68HC705 programmer | RS232 serial | Programmer build for the same 68HC705C8 chip | Development stopped |
| CIR-II | PC parallel port | Infrared receive and transmit interface for A/V equipment | Discontinued |
| STATX10 | X-10 via RJ-11 cable | LED status display for X-10 unit codes 1 to 8 | Withdrawn August 30, 2003 |
| Sensors | 1-Wire bus | DS18S20, DS2406, DS2430 parts, current transformer, MD3020E humidity board | Final catalog, sold until 2023 |
Interfaces, loggers and outputs
Serial interfaces
TEMP05 was designed to log temperatures from the Dallas Semiconductor 1-Wire weather station plus up to 20 DS18S20 thermometers, and later grew to read rain gauges, barometers and humidity sensors, up to 60 devices in total. It sent a record of readings every 1 to 99 minutes. TEMP08 replaced it when TEMP05 production ended in 2003 and added DS18B20, DS1822 and DS1920 temperature sensors, DS2423 counters, DS2450 voltage sensors, the AAG weather station, iButtons and the company's own 1WIO modules. Its option settings live in memory, so there are no jumpers to set.
Loggers
LOG08 and LOG08-II behave like the interfaces when connected to a PC, but they can also run alone and keep time-stamped samples in on-board EEPROM for later download. The product listing described more than three years of storage. LOG08 grew out of TEMP05; LOG08-II was built on TEMP08 and could address 60 sensors while logging 24 of them.
Switching and outputs
1WSwitch concentrated on switch-type devices: DS2405, DS2406 and DS2407 inputs and outputs, DS2438 voltage sensors, and up to 20 relay modules. The 1WIO module supplied those relays, using a DS2408 to drive four SPDT relays, read four opto-isolated inputs, or light up to eight LEDs. RELAY05 was the older approach, with eight relays driven by TTL lines; current TEMP08 firmware dropped support for it. RS232Relay stood apart, with four relays controlled straight from a serial port.
Tools and side projects
PROG05 programmed OTP and EPROM versions of the 68HC705C8 with a DOS program. CIR-II read and sent infrared codes through a parallel port, and STATX10 showed X-10 status on eight LEDs.
Where to go next
If you are identifying a board found in a drawer, start with the table above: the host connector usually settles the question, since only CIR-II used a parallel port and only STATX10 took an RJ-11 telephone cable. For wiring questions that apply to every 1-Wire kit, the 1-Wire network wiring guide covers cable, topology and connectors. Individual chips used across the line are described in the components reference, and user manuals and datasheets are listed in the document library.
None of the kits can be bought, repaired or supported through this site. The pages exist to explain how the hardware worked, so that boards still in service can be understood, maintained and, where it makes sense, replaced with current 1-Wire hardware and software.
Further reading: DS18B20 product page (Analog Devices) · DS2408 product page (Analog Devices)
Questions and answers
Which Midon Design kit was the most widely used?
TEMP08 was the center of the line. It replaced TEMP05 in 2003, stayed in the catalog until the company stopped selling at the end of 2023, and worked with most of the other products, including 1WIO relay and LED modules and the MD3020E humidity sensor. It also has the most detailed reference pages here.
Can any of these kits still be ordered?
No. Every kit in this catalogue is discontinued, and Midon Design stopped selling at the end of 2023. This site offers descriptions, wiring details and firmware notes only. For new installations, current 1-Wire adapters combined with software such as OWFS, the Linux w1 driver or Home Assistant are the usual route.
What is the difference between LOG08 and LOG08-II?
Both are 1-Wire loggers that can store time-stamped sensor samples without a PC attached. LOG08 was derived from TEMP05. LOG08-II was the second generation, built on TEMP08, able to address up to 60 sensors and log 24 of them, with an optional on-board humidity sensor and a choice of terminal strip or RJ-12 connection.
Do RELAY05 and RS232Relay do the same job?
Not quite. RELAY05 has eight DPDT relays driven by TTL signals, originally from a TEMP05 or TEMP08, though current TEMP08 firmware no longer supports it. RS232Relay is self-contained: four Form C relays controlled directly from a PC serial port or a USB serial adapter, with momentary, pulsed or steady operation.
Related pages
TEMP08 Serial One Wire Interface
TEMP08 linked a PC serial port to the 1-Wire bus: up to 60 sensors for temperature, humidity, rain, wind and relays, plus a real-time clock and RJ-12 jack.
TEMP05 Introduction
TEMP05 was a serial 1-Wire interface for a weather station and up to 20 DS18S20 thermometers, later 60 devices.
Sensors
1-Wire sensor chips used with Midon Design kits: DS18S20, DS18B20 and DS1822 thermometers, DS2438 humidity, DS2423 counters, DS2450, DS2408 and iButtons.
Documents
Manuals, application notes and datasheets behind the Midon 1-Wire kits, the 1-Wire application guide, a CD4094 reference and official datasheet sources.
Parts
The parts used inside Midon 1-Wire kits: DS18S20, DS2438, DS2408 and other sensor chips, 68HC705 controllers, RS232 drivers, regulators, relays and jacks.