DS18S20 1-Wire Temperature Sensor
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 (from mouser) and $1.5 (ebay from China).
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.
Connectors
- 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 Holes
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.
Datasheet
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