Differences

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--- env_sensor [2014/10/09 22:57] – [Partlist (in buildup order)] breaker27
+++ env_sensor [2015/04/15 23:03] – [Connect a SHT21 / SHT25] breaker27
@@ Line 17: / Line 17: @@
 |    1     | Resistor 100k brown-black-yellow        | R5          |  {{ parts:resistor_100k.jpg }}        |
 |    1     | Resistor 10k brown-black-orange         | R6 (for SHT15), \\ R7 + R8 (for I2C) |  {{ parts:resistor_10k.jpg }}         |
+|    1     | Resistor 4k7 yellow-violet-red          | R9 (for 1-wire) |  {{ parts:resistor_4k7.jpg }}     |
 |    1     | IC holder                               | IC1         |  {{ parts:ic_holder.jpg }}            |
 |    1     | LED 2mA                                 | LED1        |  {{ parts:led_yellow.jpg }}           |
@@ Line 98: / Line 99: @@
 <clear>
+===== Connect a SHT21 / SHT25 =====
+You can connect these sensors either the same way as the SHT15 (with the Sensirion specific protocol) or connect it as a I2C device. Configure the E2P accordingly.
+In principle, you can solder the sensor directly to cables. But the sensor is very tiny, so you should have some experience when trying to do that. Make sure to solder only one cable at a time and let the solder cool off to not overheat the sensor!
+I recommend to mount the sensor + cables to something to make sure the solder joints don't break off.
+{{sht25_size.jpg?nolink |}}{{sht25_pinout.jpg?nolink |}}{{sht25_mounted.jpg?nolink |}}
+<clear>
 ===== Connect a DS7505 =====
@@ Line 107: / Line 119: @@
 {{ds7505_connection.png?nolink |}} The pins have to be wired as shown here. You need 4k7/10k pull-up resistors as specified by the I2C standard. If you have a Generic Midi PCB Rev. 1.1 and up, just solder R7+R8 to the PCB. If you have an older PCB revision, you have to solder the resistors as shown in the picture.
+<clear>
+===== Connect a DHT11 =====
+//describe it ...//
+The four pins of the DHT11 are //GND//, //Unused//, //DATA// and //VCC//. Connect //DATA// to //PC2//.
+The sensor works when EnvSensor is powered by two AA batteries (90 Percent charge).
 <clear>
@@ Line 137: / Line 157: @@
 You should use at least AA cells for the environment sensor when using the SRF02 and the voltage converter, because one SRF02 measurement takes about 0.015 mAh, which results in ~800 days battery lifetime at AA cells (2800 mAh) when you make one measurement every 7 minutes.
-===== Integrate it into a housing =====
-describe it...
+======  Integrate it into a housing ======
+//
+describe it...//