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an SPI header
With this module
GSM 900 MHz
a 16 MHz crystal oscillator
The advantages of these modules are the VCC and TTL serial levels that have 5V voltage
LCD1604 an SPI headerSpecifications: 16 Characters * 4 Lines Character LCD module White Character Blue Backlight ,5V For Logic Circuit.
US$ 55.00
US$ 109.00
US$ 69.00
US$ 44.95
