Differences

This shows you the differences between two versions of the page.

--- env_sensor [2024/05/22 13:11] – [Connect a SRF02] breaker27
+++ env_sensor [2024/05/22 13:12] (current) – [Connect I2C sensors] breaker27
@@ Line 62: / Line 62: @@
 {{:voltage_divisor_improvement.jpg?nolink |}}  Battery voltage and brightness are measured using two voltage divisors each consisting of two resistors. The idle power consumption can be improved (down to about 21µA) by connecting the one end of them (see both left red ovals at **R3** and **R5**) to **PB6** (pin 9, the other red oval), which is only switched on when the device is actively measuring.
-You only need this modification with a PCB version Rev. < 1.2, where the resistors were not connected to the I/O pins. The advantage in power consumption is not so big if you don't have a photocell connected. To use this feature, you need also a firmware >= v0.7.0 or develop build from 06/17/2014 or later.
+You only need this modification with a PCB version Rev. < 1.2, where the resistors were not connected to the I/O pins. The advantage in power consumption is not so big if you don't have a photocell connected. To use this feature, you need also a firmware >= v0.7.0 or develop build from 06/17/2014 or later.\\\
+\\
-<clear>
 ====== Connecting specific sensors ======
@@ Line 90: / Line 88: @@
 {{:sht15_connection.jpg?nolink |}} Connect the SHT15 sensor to a ribbon cable by soldering the four pins shown on the picture. **The SHT15 is very sensitive to heat.** I suggest soldering one pin, wait a minute or two and then solder the next!
-Solder the other end of the wires to the PCB. The picture is from the top side of the PCB. The border of the PCB is at the bottom of the picture.
+Solder the other end of the wires to the PCB. The picture is from the top side of the PCB. The border of the PCB is at the bottom of the picture.\\\
+\\
-<clear>
 ==== PCB Rev. <= 1.1 ====
 {{:sht15_connection_patch.jpg?nolink |}} If you have an older PCB version you have to patch the SCK wire to the PC2 pin on the bottom side of the PCB. It is the fourth pin of the ATMega counting from the PCB border.
-If you look at the back of the PCB, you have to solder the wires as shown on the picture.
+If you look at the back of the PCB, you have to solder the wires as shown on the picture.\\\
+\\
-<clear>
 ===== Connect I2C sensors =====
-{{i2c_connection.jpg?nolink |}} The pin layout for all I2C sensors in general is like shown here. Besides power and ground, they use a clock (SCL) and a data (SDA) line.
+{{i2c_connection.jpg?nolink |}} The pin layout for all I2C sensors in general is like shown here. Besides power and ground, they use a clock (SCL) and a data (SDA) line.\\\
+\\
 ===== Connect a SHT21 / SHT25 =====