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iothings:proiecte:2021:retroweatherstation [2022/01/24 03:03] florin.dragulin |
iothings:proiecte:2021:retroweatherstation [2022/01/27 22:10] (current) florin.dragulin |
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| <sub>author Dragulin Florin Catalin</sub> | <sub>author Dragulin Florin Catalin</sub> | ||
| <sub>ACES 2022</sub> | <sub>ACES 2022</sub> | ||
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| + | [[https://github.com/DFCatalin/Retro-Look-Weather-Station|Github Project Repo]] | ||
| === I. Short Description === | === I. Short Description === | ||
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| {{:iothings:proiecte:2021:samsung_sve_11ms21.png?400| Samsung SVE 11MS21}} | {{:iothings:proiecte:2021:samsung_sve_11ms21.png?400| Samsung SVE 11MS21}} | ||
| - | Due to limited amount on the ESP32 bord, to drive those 20 pins I used a special IC which can handle higher voltages, Microchip HV5812, a serial 20-bit shift register with VDD = 4.5-5.5V for logic circuits and VPP = 20 – 80V for high voltage. | + | Due to limited amount on the ESP32 board, to drive those 20 pins I used a special IC which can handle higher voltages, Microchip HV5812, a serial 20-bit shift register with VDD = 4.5-5.5V for logic circuits and VPP = 20 – 80V for high voltage. |
| Data-In, CLK and Strobe will be driven by ESP32. To obtain 30-32V from my 9V DC power I used a switch mode power supply (SMPS) with MT3608 IC to have a higher efficiency. | Data-In, CLK and Strobe will be driven by ESP32. To obtain 30-32V from my 9V DC power I used a switch mode power supply (SMPS) with MT3608 IC to have a higher efficiency. | ||
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| *2. Slave station | *2. Slave station | ||
| - | It will be placed outside to sample temperature, humidity and pressure. To have communication with core station, I used the same microcontroller, ESP32 dev board. External parameters are capture using BMP280 with I2C interface at 3.3V logic level. | + | It will be placed outside to sample temperature, humidity and pressure. To have communication with core station, I used the same microcontroller, ESP32 dev board. External parameters are capture using BMP280 with I2C interface at 3.3V logic level |
| Outside outlets are not every time easy to get so a cordless station is needed. For that cheapest and fastest solution is to use a Li-Ion connected to 1W solar panel. Li-Ion cells have a maximum voltage at 4.2 – 4.3V when are at 100% state of charge (SOC), keep a steady voltage between 80% and 20% SOC, at 3.7V and then drop almost linearly to 2.3V. | Outside outlets are not every time easy to get so a cordless station is needed. For that cheapest and fastest solution is to use a Li-Ion connected to 1W solar panel. Li-Ion cells have a maximum voltage at 4.2 – 4.3V when are at 100% state of charge (SOC), keep a steady voltage between 80% and 20% SOC, at 3.7V and then drop almost linearly to 2.3V. | ||
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| If the battery level is low, a message indicator light will stay on until the battery is replaced or charged. The cell min threshold is 3.6V which is the minimum voltaged that can supply a steady 3.3V at LDO output pin. | If the battery level is low, a message indicator light will stay on until the battery is replaced or charged. The cell min threshold is 3.6V which is the minimum voltaged that can supply a steady 3.3V at LDO output pin. | ||
| - | To have access to sensors values at any time we can view them on a HTML page hosted by core station. To access the page, when power on the module, it will print IP address for 5 seconds. Values on page are updates using AJAX at every 10 seconds. | + | To have access to sensors values at any time we can view them on a HTML page hosted by core station. To access the page, when power on the module, it will print IP address for 5 seconds. Values on page are updated using AJAX at every 10 seconds. |
