{"id":16587,"date":"2022-08-21T14:13:49","date_gmt":"2022-08-21T06:13:49","guid":{"rendered":"https:\/\/www.rocketscream.com\/blog\/?post_type=product&#038;p=16587"},"modified":"2026-06-07T08:25:58","modified_gmt":"2026-06-07T00:25:58","slug":"mini-ultra-lora","status":"publish","type":"product","link":"https:\/\/www.rocketscream.com\/blog\/product\/mini-ultra-lora\/","title":{"rendered":"Mini Ultra LoRa"},"content":{"rendered":"<p>We added SX1276 LoRa transceiver and EUI-64 identification chip to our <a href=\"https:\/\/www.rocketscream.com\/blog\/product\/mini-ultra\/\">Mini Ultra<\/a> so you could run LoRaWAN stack such as the LMIC library with plenty of program flash memory and RAM left for your application code. The board is powered by the <a href=\"https:\/\/github.com\/MCUdude\/MegaCoreX\/\">MegaCoreX Arduino core<\/a> which is written and maintained by <a href=\"https:\/\/github.com\/MCUdude\">MCUdude<\/a>. On top of that, we added an updated <a href=\"https:\/\/github.com\/rocketscream\/RocketScream_LowPowerAVRZero\" target=\"_blank\" rel=\"noopener noreferrer\">Arduino compatible low power library<\/a> that can be used together with a <a href=\"https:\/\/github.com\/rocketscream\/RocketScream_RTCAVRZero\">simple Real Time Counter (RTC) library<\/a> also written by us to allow flexible low power management of the board (or any MCU in the AVRmega 0-series).<\/p>\n<p>Specifications:<\/p>\n<ul>\n<li>Compatible with Arduino IDE using <a href=\"https:\/\/github.com\/MCUdude\/MegaCoreX\/\">MegaCoreX Arduino core<\/a><\/li>\n<li>Microcontroller: <a href=\"https:\/\/www.microchip.com\/en-us\/product\/ATMEGA4808\">ATmega4808-MU<\/a>\n<ul>\n<li>Program flash memory: 48 kB<\/li>\n<li>RAM: 6 kB<\/li>\n<li>Data EEPROM: 256 Bytes<\/li>\n<li>3 UART<\/li>\n<\/ul>\n<\/li>\n<li>Clock:\n<ul>\n<li>Internal 8 MHz oscillator<\/li>\n<li>32.768 kHz external crystal for accurate real time counter (RTC) that still runs during sleep<\/li>\n<\/ul>\n<\/li>\n<li>Operating voltage: 3.3 V<\/li>\n<li><a href=\"https:\/\/www.ebyte.com\/en\/product-view-news.html?id=1300\">EByte E19-900M20S2<\/a> SX1276 LoRa transceiver:\n<ul>\n<li>With solder jumper to connect DIO1, DIO2 and RESET to use LoRaWAN stack by running library such as the <a href=\"https:\/\/github.com\/mcci-catena\/arduino-lmic\">LMIC stack<\/a><\/li>\n<li>Tested with <a href=\"https:\/\/github.com\/jgromes\/RadioLib\">Jan Grome\u0161&#8217; RadioLib library<\/a> for pure LoRa usage<\/li>\n<\/ul>\n<\/li>\n<li>2Kb I2C Serial EEPROM with Pre-Programmed EUI-64\u2122 MAC ID 24AA025E64T:\n<ul>\n<li>Unique 64-bit identification to be used as <a href=\"https:\/\/www.thethingsnetwork.org\/docs\/lorawan\/addressing\/\">DevEUI in LoRaWAN network<\/a><\/li>\n<li>Can be used as small storage logging<\/li>\n<\/ul>\n<\/li>\n<li>Low quiescent current (0.3 \u03bcA) on-board 3.3 V 300 mA buck-boost switching regulator<\/li>\n<li>Ultra low power: Minimum 5.0 \u03bcA in power down mode with input at 3.6V<\/li>\n<li>External DC source range: 1.8 \u2013 5.5 V\n<ul>\n<li>Auto power switching between power source applied on the VBAT pin on breakout pin or VIN pin on the FTDI 6-pin header<\/li>\n<li>Option to use various battery type, cell combination and chemistry such as 2xAA or 3xAA (alkaline, NiMH), CR123A, LiFeFO4, Li-Ion\/Pol<\/li>\n<\/ul>\n<\/li>\n<li>Red indicator LED connected to digital pin 7<\/li>\n<li>FTDI 6-pin header with additional UPDI interface:\n<ul>\n<li>Upload code either through serial or burn code directly using UPDI programmer like our <a href=\"https:\/\/github.com\/ElTangas\/jtag2updi\">jtag2updi<\/a> based <a href=\"https:\/\/www.rocketscream.com\/blog\/product\/updi-usb-serial-adapter\/\">UPDI-USB-Serial Adapter board<\/a><\/li>\n<\/ul>\n<\/li>\n<li>Battery power monitoring on pin A5<\/li>\n<li>Analog reference voltage with LC filter<\/li>\n<li>Easy access side tactile reset switch<\/li>\n<li>No on-board charger<\/li>\n<li>4 M2 mounting holes<\/li>\n<li>800 mil in between 2 breakout headers &#8211; suitable for breadboard usage<\/li>\n<li>Dimension: 22.86 mm x 44.45 mm (0.90\u2033 x 1.75\u2033)<\/li>\n<li>FR-4 4-layer PCB with ENIG surface finish<\/li>\n<li>RoHS compliant: Yes!<\/li>\n<\/ul>\n<p>Documentation:<\/p>\n<ul>\n<li><a href=\"https:\/\/github.com\/rocketscream\/MiniUltraLoRa\/blob\/master\/MINI-ULTRA-LORA.pdf\">Schematic<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/rocketscream\/MiniUltraLoRa\">Design files on Github<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/rocketscream\/MiniUltraLoRa\/blob\/master\/ttn-otaa-mcci.ino\">LMIC OTAA sleep example<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/rocketscream\/RocketScream_LowPowerAVRZero\" target=\"_blank\" rel=\"noopener noreferrer\">Arduino compatible low power library<\/a><\/li>\n<li><a href=\"https:\/\/github.com\/rocketscream\/RocketScream_RTCAVRZero\">Arduino compatible simple Real Time Counter (RTC) library<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>ATmega4808 based ultra low power Arduino compatible board.<\/p>\n","protected":false},"featured_media":16590,"comment_status":"open","ping_status":"closed","template":"","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0},"product_brand":[],"product_cat":[93,91,174],"product_tag":[],"class_list":{"0":"post-16587","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-arduino-and-compatibles","7":"product_cat-boards-kits","8":"product_cat-mini-ultra-series","10":"first","11":"instock","12":"featured","13":"shipping-taxable","14":"purchasable","15":"product-type-variable"},"_links":{"self":[{"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/product\/16587","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/comments?post=16587"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/media\/16590"}],"wp:attachment":[{"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/media?parent=16587"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/product_brand?post=16587"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/product_cat?post=16587"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.rocketscream.com\/blog\/wp-json\/wp\/v2\/product_tag?post=16587"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}