PCB schemas and boards, eagle format (7.5)
mainboard is... the main board, with MCU including wifi, power, motor driver etc...
On this mainboard can be plugged ONE of the shield :
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SFM10R1 : sifgox (Europe)
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RN2483A : LoraWan
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SIM800L : GSM 2G
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SIM7000E : GSM 4G Nb-IoT
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template : base for a future new shield