{"product_id":"linkmejor-antenna-mmdvm-hotspot-support-p25-dmr-ysf-for-raspberry-pi","title":"Antenna MMDVM Hotspot Support P25 DMR YSF for Raspberry pi","description":"\u003cdiv id=\"specification\"\u003e\u003c\/div\u003e\u003cdiv id=\"specification_end\"\u003e\u003c\/div\u003e\u003cp\u003e\u003cb\u003eSTM32_MMDVM_HS HAT Guide\u003c\/b\u003e\n\nnew pi4b need remove R1 Resistor.\n\n\u003cb\u003eSTM32_MMDVM_HS HAT Rev1.7 Guide\u003c\/b\u003e\n\n1.Hardware add (SDA,SCL)R20,R21 Connect stm32 i2c 2 bus to OLED,and raspi.  oled message pwr on without RPI using mmdvm_hs custom fw,and i2c 2 bus. \u003c\/p\u003e\u003cp\u003e2.Support i2c communition with raspi \u003c\/p\u003e\u003cp\u003eSetting For Pi-star software and raspberry hardware (rpi 0-3) new pi4b need remove R1 Resistor. \u003c\/p\u003e\u003cp\u003eController Mode: Simplex Node\u003cbr\u003e\u003c\/p\u003e\u003cp\u003eRadio Frequency: Freq:144-148,219-225,(Main Band)420-475,842-950 \u003c\/p\u003e\u003cp\u003eExample: 438.000000 \u003c\/p\u003e\u003cp\u003eRadio\/Modem Type: STM32-DVM(GPIO) \u003c\/p\u003e\u003cp\u003e14.7456 TCXO with RXOFFSET=0 TXOFFSET=0\n\n\u003cb\u003eQuick start:\u003c\/b\u003e\n\n1.download image https:\/\/www.pistar.uk\/downloads\/  write it to card \u003c\/p\u003e\u003cp\u003e2.insert card to rpi \u003c\/p\u003e\u003cp\u003e3.wait to boot 5 minutes connect wifi Pi-star-setup pass raspberry \u003c\/p\u003e\u003cp\u003e4.open http:\/\/pi-star\/admin\/\n5.set freq ,dmr id ,dmr mode,add home's wifi ssid...\nDefault Username: pi-star\nDefault Password: raspberry\n\nto support i2c communication change MMDVM_HS code(by Andy Uribe CA6JAU)-\u0026gt;Config.h\n\n\/\/ Host communication selection:\n\n\/\/#define STM32_USART1_HOST\n\n\/\/#define STM32_USB_HOST\n\n#define STM32_I2C_HOST\n\nto disable i2c 2 to raspi and oled just remove R20,R21  \n\nupdate new FW: (pi-star \/ expert \/ ssh access \/ user :pi-star pass:raspberry)\n\nsudo pistar-mmdvmhshatflash hs_hat\n\nps:update new FW no oled pwr on message.\n\nmode  info pls visit\n\nwww.mmdvm.club\u003c\/p\u003e","brand":"LinkMejor","offers":[{"title":"Default Title","offer_id":49121064747233,"sku":"BG-2018078","price":22.49,"currency_code":"HKD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0853\/9317\/8849\/files\/81ec4679-b8ed-4323-9c47-ed65023370bd.jpg?v=1789397127","url":"https:\/\/ontproduct.com\/products\/linkmejor-antenna-mmdvm-hotspot-support-p25-dmr-ysf-for-raspberry-pi","provider":"IvySource","version":"1.0","type":"link"}