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--- en:hardware:homelab:sensor:v52 [2012/05/29 15:56] – raivo.sell
+++ en:hardware:homelab:sensor:v52 [2020/07/20 12:00] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-====== Sensor module 5.2 ======
+<pagebreak>
+====== Sensor module ======
+Sensor module includes Sensor board with on-board sensors, low-pass filter and external sensors.
+Sensor module features
+  * Electret microphone
+  * Light intensity sensor (photoresistor) VT935G (resistance 18,5 kΩ on 10 lux) {{:kit:datasheets:ldr.pdf|datasheet}}
+  * Temperature sensor (thermistor NTC) (resistance 10 kΩ on 25 °C) {{:kit:datasheets:ntc10k.pdf|datasheet}}
+  * Potentiometer 10 kΩ
+  * Ultrasonic distance measure sensor Devantech SRF05 with cable (measuring distance 1-400 cm) {{:kit:datasheets:srf05tech.pdf|datasheet}}
+  * Infrared distance sensor Sharp GP2Y0A21YK0F (measuring distance 10-80 cm) {{:kit:datasheets:sharp_gp2y0a21yk0f.pdf|datasheet}}
 {{:examples:sensor:andurite_plaat_v5.2.jpg?550|}}
+===== Electrical connections =====
+On-board sensors are connected as follows:
+^on-board notation^external notation^on-board sensor^microcontroller port^
+|MIC|AD0|Microphone|PF0|
+|LDR|AD1|Light intensity sensor|PF1|
+|NTC|AD2|Temperature sensor|PF2|
+|POT|AD3|Potentiometer|PF3|
+==== Sensors ====
+Every sensor on the board is connected through the multiplexer, enabling to select between on-board sensor or external sensor which can be connected to the same port through the connectors. By default all on-board sensors are connected to the analogous inputs of the microcontroller (ADC0-ADC3). Multiplexer is controlled with the port PG0.
+[{{:examples:sensor:multiplexer_sch_v51.png?200  |Schematics of multiplexer}}]
+[{{:examples:sensor:sensors_sch_v51.png?580  |Schematics of sensor connections}}]
+==== Low-pass filter ====
+Low-pass filter can be composed between external analogous inputs 0-3 (PF0-PF3). Resistor and capacitor will be connected to the socket for building up the low-pass filter. By default a low-pass filter is not composed only 1 Ohm resistors are included for all channels.
+[{{:examples:sensor:rc_sch_v51.png?580  |Schematics of external sensor connections and low-pass filter}}]
+==== Digital I/O connector ====
+In addition to sensors and analog inputs, there is a connector for digital I/O. Digital I/O pins are directly connected to pins PE2-PE5 of the controller.
+Also digital serial interface connector is in use (74HCT165D), which is convenient for connecting similar digital sensors. Digital serial interface is connected as following: clock input - PC7, asynchronous parallel load input (active LOW) - PA6, serial output from the last stage - PA7.
+[{{:examples:sensor:dio_sch_v52_2.png?580  |The digital input/output connectors}}]