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Description of the Design

Purpose is to have 1-Wire Temperature sensors which can be cheaply and easily deployed. DS18S20 sensors can be purchased for between $5 [1] from mouser) and $1.5 [2]

This board is small but powerful since all a 1-wire part needs to operate is a single wire (plus a ground).

The devices can be daisy-chained together (actually they are connected in parallel). The first device in a 1-Wire chain needs to have a 4.7K pullup to +5V and this card provides for that option.




  • Pair of connectors provided for chaining together 1-wire sensors. That way the cabling can be simple.
  • Pinout matches the GVS (Ground, +V, Sensor) order of Arduino Sensor shields but for most uses only the G and S are needed.
  • For the first device in a chain, J1 should be left open, R1 should be installed and power brought into the card on the V pin.
  • For devices other than the first device in the chain, J1 connector should be jumpered across.

Parts List

Desc	Qty	Footprint	RefDes	Mfg	MfgPN	Vendor	VendorPN
4.7K	1	R4	R1	Xicon	291-4.7K-RC	Mouser	291-4.7K-RC
CONN_1	2	MTG-4-40	MTG1, MTG2	N/A	N/A	N/A	N/A
CONN_2	1	PIN_ARRAY_2X1	J1	FCI	68002-102HLF	Mouser	649-68002-103HLF
CONN_3	2	PIN_ARRAY_3X1	J2, J3	FCI	68002-103HLF	Mouser	649-68002-103HLF
DS18S20+	1	TO92-123	U1	Maxim	DS18S20 +	Mouser	700-DS18S20

Mounting Hole

  • A single 4-40 mounting hole is provided to allow the card to be zip-tied into the location to be monitored. For permanent installation, the single point can be screwed down with a standoff.