My fritzing parts for my IoT projects.

1. MCP23017 (CJMCU-2317 board) - Example of usage - GPIO ports expander. The module available at Aliexpress.
   
2. SIM800C board - Example of usage - 2G GSM board SIM800C. The module available at Aliexpress.
   
3. RS485 (XY-017 board) - Example of usage- RS485 interface board. The module available at Aliexpress.
   
4. XY-ItoV - Example of usage - Current 4..20 mA to voltage board. The module available at Aliexpress.
   
5. SIM800L - 2G GSM board SIM800L. The module available at Aliexress.
   
6. MH-ET Live ESP32 Devkit 38 pins - The module available at Aliexpress.
   
7. GY-ADS1115 (cherry board) - The module available at Aliexpress.
   
8. RS485 (MAX3485 chip) - Example of usage - Inexpensive RS485 board. The module available at Aliexpress.
   

Third parties fritzing parts (links to orig resources)

1. MAX31855. MAX31855. Example of usage. The module available at Aliexpress.
   
2. ESP32 chip.
   
3. LuaNode32_ESP32_30pins.
   
4. NodeMCU_ESP8266.
   
5. ADS1115 (blue board). The module available at Aliexpress.
   
6. MCP23017 extender (blue board).