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METESP
-
-
A measurement station by Cedric Hölzl
+
+
A measurement station by Cedric Hölzl
Goal
Build an environment quality monitor.
- Powered by FreeRTOS, a low power IOT device
+ Powered by FreeRTOS, and a low power IOT device
@@ -41,8 +41,8 @@
- Low power, dual-core processor
- - C/C++ & FreeRTOS support
- - WiFi & BLE support
+ - C/C++ & FreeRTOS support
+ - WiFi & BLE support
@@ -51,10 +51,10 @@
- BM280: temperature, humidity & pressure
- - SGP40: Volatile Organic Compounds (VOC)
- - LTR390-UV-1: UV
- - TSL25911: ambient light (infrared & visible)
- - PMSA003I : particle concentration by size
+ - SGP40: Volatile Organic Compounds (VOC)
+ - LTR390-UV-1: UV
+ - TSL25911: ambient light (infrared & visible)
+ - PMSA003I : particle concentration by size
@@ -63,9 +63,9 @@
- GT1151: Touch
- - Multiple views of live data
- - Low power consumption
- - User interaction
+ - Multiple views of live data
+ - Low power consumption
+ - User interaction
@@ -74,8 +74,8 @@
- Exterior realtime data source
- - Free API access
- - +200'000 cities
+ - Free API access
+ - +200'000 cities
@@ -83,8 +83,8 @@
- Influx DB, open source database system
- - Time-Series optimized storage
- - Lightweight HTTP client
+ - Time-Series optimized storage
+ - Lightweight HTTP client
@@ -93,8 +93,8 @@
- Get time from the network
- - Compute & display local time
- - Keep it up-to-date using internal RTC
+ - Compute & display local time
+ - Keep it up-to-date using internal RTC
@@ -105,27 +105,27 @@
- 2 wires: clock & data
- - Device have unique address
- - Bi-directional, half-duplex
- - Simple protocol
+ - Targets have unique address
+ - Bi-directional, half-duplex
+ - Simple protocol
I2C protocol
- - Select device with R/W capability
- - Select register
- - Send/Read data
+ - Select target with R/W capability
+ - Select register
+ - Send/Read data
Technical specs
- 100kbps usually, up to multiple Mbps
- - 120 target devices in 7 bit mode
- - Some devices have 10 bit addresses
- - Some devices have multi-byte register addresses
+ - 120 target devices in 7 bit mode
+ - Some targets have 10 bit addresses
+ - Some targets have multi-byte register addresses
@@ -137,25 +137,25 @@
- +4 wires: clock, controller-data, target-data, chip-select
- - Device have unique address
- - Bi-directional, full duplex
- - More complex protocol
+ - Target have unique address/CS
+ - Bi-directional, full duplex
+ - More complex protocol
SPI protocol
- Multiple configurations (direct or chained, data lines)
- - For the EPD, library is provided by constructor
+ - For the EPD, library is provided by constructor
Technical specs
- 1Mbps usually, ~2x the speed of I2C, up to hundreds of Mbps
- - Possibility for multiple data lines to increase bandwidth further
- - Target number limited by IO in direct configuration
- - Target number limited by delay in chained configuration
+ - Possibility for multiple data lines to increase bandwidth further
+ - Target number limited by IO in direct configuration
+ - Target number limited by delay in chained configuration
@@ -167,9 +167,9 @@
- Manually imported certificates
- - GET from OWM (JSON)
- - POST to Telegram & DB (String)
- - JSON handled with arduinojson library
+ - GET from OWM (JSON)
+ - POST to Telegram & DB (String)
+ - JSON handled with arduinojson library