Just for Fun

1 Wire / iButton

These are my initial 1wire prototypes and were developed three years ago. They are still in service in my home. I plan on making some smaller units using SMD parts. They are rather basic but do the job well.


 The Input/Output IC's that I use on the below boards are either DS2406 (Single Input or Output only) or DS2406P Dual I/O either I/O bit can be input or output. This is a surface mount device located under the PCB.

Current Projects

*   Non Powered Input

I deem a non powered input, to be an input from the real world that relies solely on the 1Wire interface for power. I prefer not to use these style of interfaces because the actual 1wire interface can only deliver so much power before the network communications start to suffer, i.e. errors and unreliable operation.
I only use this style of interface in areas where space is at a premium, i.e. within a PIR movement sensor. The board requires a voltage free set of contacts.


*  Powered Input

This style of input does not draw any extra power from the 1wire interface other than what is required by the IC itself, i.e. the pull-up resistor for the switch is derived from the 12V Power supply, plus it also has onboard visual indication of the input state (LED). The board requires a voltage free set of contacts.


*  Relay Output Board

This board provides a set of relay contacts rated at 240VAC 5A. I don't know that I would trust having this kind of Voltage and current so close to my 1Wire interface.


*  Powered Input & Relay Output Board

I thought the above relay output board was a bit crude for general use around the place so I developed the below unit. I think this looks better. This unit has the same output characteristics as the above relay board i.e. 240VAC @ 5A and it also has a voltage free set of input contacts. I use the below modules in places like the pool pump control. Under normal circumstances the pump is controlled by MisterHouse through appropriate timers based on the time of the year i.e. summer 2 hours in the morning, three hours in the afternoon. Pressing the switch reverses the pumps current state i.e. turns the pump ON if it is currently OFF. I have also used these in places such as bathroom movement sensor and light control instead of two separate boards as per above (Non powered input and a Relay output board).

There is a RED Led to indicate when the output has been turned ON.



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