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Adafruit 16-Channel PWM / Servo HAT
$ 25.00
The Adafruit 16-Channel 12-bit PWM/Servo HAT will drive up to 16 servos or PWM outputs over I2C with only 2 pins
The Raspberry Pi is a wonderful little computer, but one thing it isn't very good at is controlling DC Servo Motors - these motors need very specific and repetitive timing pulses to set the position. Instead of asking the Pi Linux kernel to send these signals, pop on this handy HAT! It adds the capability to control 16 Servos with perfect timing. It can also do PWM up to 1.6 KHz with 12 bit precision, all completely free-running.
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LoRa Hat
$ 89.35
Make your Pi a LoRa network station, and GPS location provider LoRa/GPS Long Range Transceiver HAT 915 MHz (North America)
LoRa Modem/nl FSK, GFSK, MSK, GMSK, LoRa and OOK modulation/nl Automatic RF Sense and CAD with ultra-fast AFC/nl Support DGPS, SBAS(WAAS/EGNOS/MSAS/GAGAN)/nl GPS automatic switching between internal patch antenna and external active antenna/nl PPS VS. NMEA can be used in time service/nl Support SDK command/nl Built-in LNA for better sensitivity/nl EASY, advanced AGPS technology without external memory/nl Always Locate, an intelligent controller of periodic mode/nl GPS FLP mode, about 50% power consumption of normal mode/nl GPS support short circuit protection and antenna detection
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