Update to more comprehensive steps

docs/howto-compile.md

@@ -2,15 +2,15 @@
 
 ## Prequisite
 
-Arduino IDE version 2.x
+Arduino IDE version 2.x ([download](https://www.arduino.cc/en/software))
 
 ## Steps for ESP32C3 based board (ONE and Open Air Model)
 
-1. Install esp32 board on board manager with version **2.0.17**
+1. Install "esp32 by Espressif Systems" in board manager with version **2.0.17** (Tools ➝ Board ➝ Boards Manager ➝ search for `"espressif"`)
 
 ![board manager](images/esp32-board.png)
 
-2. Install AirGradient library on library manager using the latest version (at the time of writing, its 3.2.0)
+2. Install AirGradient library on library manager using the latest version (Tools ➝ Manage Libraries... ➝ search for `"airgradient"`) 
 
 ![Aigradient Library](images/ag-lib.png)
 
@@ -24,7 +24,7 @@ Core Debug Level ➝ None (or choose as needed)
 Erase All Flash Before Sketch Upload ➝ Enabled (or choose as needed)
 Flash Frequency ➝ 80MHz
 Flash Mode ➝ QIO
-Flash Size ➝ 4MB
+Flash Size ➝ 4MB (32Mb)
 JTAG Adapter ➝ Disabled
 Partition Scheme ➝ Minimal SPIFFS (1.9MB APP with OTA/190KB SPIFFS)
 Upload Speed ➝ 921600
@@ -32,17 +32,29 @@ Upload Speed ➝ 921600
 
 ![Compile Settings](images/settings.png)
 
-4. Compile
+4. Open sketch to compile (File ➝ Examples ➝ AirGradient Air Quality Sensor ➝ OneOpenAir). This sketch for AirGradient ONE and Open Air monitor model
+5. Compile
+
+![compiled esp32](images/compiled.png)
 
 ## Steps for ESP8266 based board (DIY model)
 
-1. Add esp8266 board by adding http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Board Manager URLs field.
-2. Install esp8266 board on board manage with version **3.1.2**
+1. Add esp8266 board by adding http://arduino.esp8266.com/stable/package_esp8266com_index.json into Additional Board Manager URLs field (File ➝ Preferences ➝ Additional boards manager URLs)
+
+![additional-board](images/additional-board.png)
+
+2. Install esp8266 board on board manager with version **3.1.2** (Tools ➝ Board ➝ Boards Manager ➝ search for `"esp8266"`)
 
 ![board manager](images/esp8266-board.png)
 
-3. Set board to `LOLIN(WEMOS) D1 R2 & mini`, let other settings to default
-4. Compile
+3. On tools tab, set board to `LOLIN(WEMOS) D1 R2 & mini`, and let other settings to default
+
+![settings esp8266](images/settings-esp8266.png)
+
+4. Open sketch to compile (File ➝ Examples ➝ AirGradient Air Quality Sensor ➝ `<Model Option>`). Depends on the DIY model, either `BASIC`, `DiyProIndoorV3_3` and `DiyProIndoorV4_2` 
+5. Compile
+
+![compiled esp8266](images/compiled-esp8266.png)
 
 ## Possible Issues