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Diffstat (limited to 'slides')
| -rw-r--r-- | slides/connected-arduino-slides.pdf | bin | 293791 -> 287191 bytes | |||
| -rw-r--r-- | slides/connected-arduino-text.pdf | bin | 298798 -> 287028 bytes | |||
| -rw-r--r-- | slides/connected-arduino.md | 449 | ||||
| -rw-r--r-- | slides/toc.md | 43 |
4 files changed, 173 insertions, 319 deletions
diff --git a/slides/connected-arduino-slides.pdf b/slides/connected-arduino-slides.pdf Binary files differindex cc258eb..7849f9a 100644 --- a/slides/connected-arduino-slides.pdf +++ b/slides/connected-arduino-slides.pdf diff --git a/slides/connected-arduino-text.pdf b/slides/connected-arduino-text.pdf Binary files differindex 6882209..3ad5987 100644 --- a/slides/connected-arduino-text.pdf +++ b/slides/connected-arduino-text.pdf diff --git a/slides/connected-arduino.md b/slides/connected-arduino.md index 16f93d4..512f8cb 100644 --- a/slides/connected-arduino.md +++ b/slides/connected-arduino.md @@ -16,167 +16,10 @@ header-includes: --- -# NodeMCU - -!comment(aka NodeMCU aka ESP-12) - -## NodeMCU hardware - -!ifndef(QUICK)( - -) - -## NodeMCU hardware - -!ifndef(QUICK)( -\begin{center} -!include(images/nodemcu.pgf) -\end{center} -) - -## ESP8266 software layers - -!ifndef(QUICK)( -\begin{center} -!include(images/esp+arduino-sdks.pgf) -\end{center} -) - -## ESP8266 + Arduino - -* Standard Arduino IDE -* ESP8266 Arduino core - * https://github.com/esp8266/Arduino - -## Arduino IDE - -!ifndef(QUICK)( - -) - -## Arduino code structure - -~~~ .c++ -void setup() { - // Called once -} - -void loop() { - // Called repeatedly -} -~~~ - -::: notes - -MCU programming is often structured into: - -* Configure - * CPU - * GPIO ports - * MCU's peripherals - * The rest of the board - * Configure application and callbacks. -* Sleep - -Arduino chooses to run the cpu at 100% instead of the sleep step.. - -::: - -## Arduino file structure - - foo/ - foo.ino - config.h - -::: notes - -`foo.ino` must always be in a `foo` directory. - -config.h is created by "new tab". - -::: - -## Generic Arduino APIs - -~~~c++ -// Pin: D0, D1, etc. -// Mode: OUTPUT, INPUT, INPUT_PULLUP -void pinMode(uint8_t pin, uint8_t mode); - -// State: HIGH, LOW, true/false, 1/0 -void digitalWrite(uint8_t pin, uint8_t state); -int digitalRead(uint8_t pin); - -unsigned long now millis(); -unsigned long now micros(); -~~~ - -## ESP Arduino APIs - -~~~c++ -class { - void restart(); - uint32_t getFreeHeap(); - uint32_t getChipId(); - - ... -} ESP; - -// Usage -ESP.restart(); -~~~ - -## ESP - -~~~c++ -// Top of file -#include <ESP8266WiFi.h> - -// In setup() -WiFi.mode(WIFI_STA); -WiFi.begin(ssid, password); - -while (WiFi.status() != WL_CONNECTED) { - delay(500); - Serial.print("."); -} - -Serial.println(""); -Serial.println("WiFi connected"); -Serial.println("IP address: "); -Serial.println(WiFi.localIP()); -~~~ - -## ESP Arduino APIs - -~~~c++ -class { - String macAddress(); - - wl_status_t status(); - int32_t RSSI(); - - IPAddress localIP(); - IPAddress subnetMask(); - IPAddress gatewayIP(); - IPAddress dnsIP(uint8_t dns_no = 0); - - ... -} WiFi; - -// Usage: - -Serial.println(WiFi.localIP().toString()); -~~~ - -::: notes - -http://arduino-esp8266.readthedocs.io/en/latest/libraries.html - -::: - # What is IoT +!comment +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ## What is IoT * Not "a computer connected to the internet" @@ -205,6 +48,7 @@ As for their definition. What differentiates a computer from an IoT device? ::: +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ## What is an IoT Device? @@ -214,12 +58,17 @@ What differentiates a computer from an IoT device? * Network bandwidth and/or latency * Storage * Has connectivity + +!comment +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +* Has connectivity * Bluetooth * Wi-Fi * NB-IoT * LTE Cat-M * LoRa * Proprietary radio +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ::: notes @@ -260,7 +109,26 @@ single company. LoRa chips are just trancievers, an MCU with LoRa stack is required. ::: -## ESP8266 details - Power usage +## ESP8266 Specifications + ++-------------+-----------------------------+ +| CPU | Tensilica Xtensa L106 | ++-------------+-----------------------------+ +| Frequency | 80MHz (160MHz possible | ++-------------+-----------------------------+ +| RAM | 32 kB instruction RAM | +| | 80 kB user RAM | +| | 16 kB system RAM | ++-------------+-----------------------------+ +| Flash | None, integrated SPI driver | ++-------------+-----------------------------+ +| Peripherals | 16 x GPIO | +| | I²C, SPI, I²S, UART | +| | 10 bit ADC | +| | Wi-Fi | ++-------------+-----------------------------+ + +## ESP8266 Power usage +--------------------------+----------------+ | State | Current usage | @@ -282,6 +150,61 @@ Datasheet page 18 ::: +# NodeMCU + +!comment(aka NodeMCU aka ESP-12) + +## NodeMCU hardware + +!ifndef(QUICK)( +\begin{center} +!include(images/nodemcu.pgf) +\end{center} +) + +## NodeMCU hardware + +!ifndef(QUICK)( + +) + +## ESP8266 software layers + +!ifndef(QUICK)( +\begin{center} +!include(images/esp+arduino-sdks.pgf) +\end{center} +) + +## ESP8266 + Arduino + +* Standard Arduino IDE +* ESP8266 Arduino core + * https://github.com/esp8266/Arduino + +## Arduino IDE + +!ifndef(QUICK)( + +) + +## Generic Arduino APIs + +~~~c++ +// Pin: D0, D1, etc. +// Mode: OUTPUT, INPUT, INPUT_PULLUP +// State: HIGH, LOW, 1/0 + +void pinMode(pin, mode); +void digitalWrite(pin, state); +int digitalRead(pin); + +unsigned long now = millis(); +unsigned long now = micros(); +~~~ + +# Assignment: `blink-a-led` + # Lecture: MQTT ## MQTT @@ -313,7 +236,7 @@ Version 3.1.1 er den som gjelder, V 3.1 er rar, de andre finnes ikke \end{center} ) -## MQTT Topic +## MQTT Example The temperature sensor: @@ -343,41 +266,6 @@ Commands can be: ::: -## MQTT - Implementations - -* Mosquitto -* Eclipse Paho -* RabbitMQ -* ActiveMQ - -::: notes - -RabbitMQ has a separate connector that must be installed -Not sure about ActiveMQ but it is at least a part of the project so it is releases at the same time. - -::: - -## MQTT Cloud Connectors - -* Cloud - * Amazon IoT - * Google Cloud IoT - * Microsoft Azure IoT - * CloudMQTT (at Heroku) - -* DIY - * ThingMQ - * HiveMQ - -::: notes - -In between are: - -* self hosted -* Generic bridges - -::: - ## MQTT - The protocol Agents have one of two roles: @@ -392,8 +280,8 @@ Agents have one of two roles: * Keeps subscriptions * Manages client * Timeouts and disconnects - * *(last) will* - * Persistence of retained messages + * *last will* + * Persistence of *retained* messages ::: notes @@ -418,76 +306,68 @@ Push vs pull, central applications can push to clients * `foo/bar/?` * `foo/#` -## MQTT - The protocol - Retained message - -Message is kept by the server even after disconnect - -* `CONNECT` -* `PUBLISH` - * `RETAIN` - * `$app/$device/temperature` - * `22.3` -* `DISCONNECT` - -Later on: - -* `SUBSCRIBE` - * `$app/#/temperature` -* `PUBLISH` - * `$app/$device/temperature` - * `22.3` - -::: notes +## ESP Arduino APIs -The last PUBLISH is an incoming message +~~~c++ +class { + void restart(); + uint32_t getFreeHeap(); + uint32_t getChipId(); -::: + ... +} ESP; -## MQTT - The protocol - Will message +// Usage +ESP.restart(); +~~~ -Message sent when you disconnect +## Connecting to a Wi-Fi -Client #1: +~~~c++ +#include <ESP8266WiFi.h> -1. `CONNECT` - * `WILL TOPIC: $app/$device/online` - * `WILL PAYLOAD: 0` -1. `PUBLISH` - * `$app/$device/online` - * `1` -1. `DISCONNECT` +void setup() { + WiFi.mode(WIFI_STA); + WiFi.begin("NDC2018", NULL); -Broker + while (WiFi.status() != WL_CONNECTED) { + delay(500); + Serial.print("."); + } -1. *To all subscribers* `PUBLISH` - * `$app/$device/online` - * `0` + Serial.println(""); + Serial.println("WiFi connected"); + Serial.println("IP address: "); + Serial.println(WiFi.localIP()); +} +~~~ ## MQTT on Arduino PubSubClient is our MQTT client implementation. +Preparing to publish messages: + ~~~c++ +#include <ESP8266WiFi.h> #include <PubSubClient.h> WiFiClient wifiClient; PubSubClient mqtt(wifiClient); -void callback(char* topic, - byte* payload, - unsigned int length); +String deviceId = "esp-" + String(ESP.getChipId(), HEX); void setup() { - // Configure WiFi - mqtt.setServer(mqtt_server, 1883); - mqtt.setCallback(callback); + // ... + mqtt.setServer("broker.hivemq.com", 1883); } ~~~ ## MQTT on Arduino ~~~c++ -void loop() { +void loop() +{ if (!mqtt.connected()) { reconnect(); } @@ -497,71 +377,52 @@ void loop() { // Do work } +~~~ -void reconnect() { +## MQTT on Arduino + +~~~c++ +void reconnect() +{ do { Serial.println("Connecting to MQTT"); delay(1000); - } while (!mqtt.connect(client_id)); - Serial.println("Connected to MQTT server"); + } while (!mqtt.connect(clientId.c_str())); - // Subscribe to any topics you need - mqtt.subscribe(topic_pattern); + Serial.println("Connected to MQTT server"); } ~~~ -::: notes -This is blocking! -::: - -## Assignment - -* `mqtt` - -## MQTT topic architecture - -The central application is split: - -* An aggregating agent: - * `myapp/#/temperature` - * `myapp/#/humidity` -* Emailing agent - * `myapp/$device-id/altert` - -* Publishes on: - * `myapp/$device-id/command` - -## MQTT topic architecture - -!ifndef(QUICK)( -\begin{center} -!include(images/mqtt-example-architecture.pgf) -\end{center} -) - -## MQTT topic architecture - -!ifndef(QUICK)( -\begin{center} -!include(images/mqtt-example-architecture2.pgf) -\end{center} -) - -## MQTT - Patterns - -* Combining MQTT and HTTP -* Using web sockets transport +## MQTT on Arduino -## Assignment +~~~c++ +void sendMessage() +{ + String topic = "ndc/" + deviceId + "/led"; + mqtt.publish(topic.c_str(), "1"); +} +~~~ -* `mqtt2` +## MQTT on Arduino -## Assignment +Preparing for subscriptions: -* `mqtt3` +~~~c++ +void setup() { + ... + mqtt.setCallback(callback); +} -::: notes +void callback(char* topic, + byte* payload, + unsigned int length) { +} -discussion: how to connect these two devices? +void reconnect() { + ... + // Subscribe to any topics you need + mqtt.subscribe(topic_pattern); +} +~~~ -::: +# Assignment: `mqtt-with-button` diff --git a/slides/toc.md b/slides/toc.md index 227f00a..d137e28 100644 --- a/slides/toc.md +++ b/slides/toc.md @@ -1,40 +1,33 @@ +* What is IoT + * What is IoT + * IoT is just a concept + * What is an IoT Device? + * What is an IoT Device? + * IoT Devices - Example chips + * ESP8266 Specifications + * ESP8266 Power usage * NodeMCU * NodeMCU hardware * NodeMCU hardware * ESP8266 software layers * ESP8266 + Arduino * Arduino IDE - * Arduino code structure - * Arduino file structure * Generic Arduino APIs - * ESP Arduino APIs - * ESP -#include <ESP8266WiFi.h> - * ESP Arduino APIs -* What is IoT - * What is IoT - * IoT is just a concept - * What is an IoT Device? - * What is an IoT Device? - * IoT Devices - Example chips - * ESP8266 details - Power usage +* Assignment: `blink-a-led` * Lecture: MQTT * MQTT * Device and application architecture with MQTT - * MQTT Topic - * MQTT - Implementations - * MQTT Cloud Connectors + * MQTT Example * MQTT - The protocol * MQTT - The protocol - MQTT Topic - * MQTT - The protocol - Retained message - * MQTT - The protocol - Will message + * ESP Arduino APIs + * Connecting to a Wi-Fi +#include <ESP8266WiFi.h> * MQTT on Arduino +#include <ESP8266WiFi.h> #include <PubSubClient.h> * MQTT on Arduino - * Assignment - * MQTT topic architecture - * MQTT topic architecture - * MQTT topic architecture - * MQTT - Patterns - * Assignment - * Assignment + * MQTT on Arduino + * MQTT on Arduino + * MQTT on Arduino +* Assignment: `mqtt-with-button` |