{"product_id":"mellow-fly-pt100-stick-thermistor-board-3v-5v-spi-voron-3d-printer-marlin-klipper","title":"Mellow FLY PT100 Thermistor Board 3.3V\/5V SPI | Voron Marlin","description":"\n\u003ch2\u003eMellow FLY PT100 Stick Thermistor Board – 3.3V\/5V SPI Interface\u003c\/h2\u003e\n\u003cp\u003eUpgrade your Voron or other 32-bit 3D printer's temperature sensing with the \u003cstrong\u003eMellow FLY PT100 Stick Thermistor Board\u003c\/strong\u003e (Model: 20PT100SB). Originally designed by Raymond H, this compact add-on board plugs directly into a stepper driver port and communicates via SPI, giving your hotend ultra-accurate PT100 RTD temperature readings without requiring a dedicated thermistor input. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual voltage support:\u003c\/strong\u003e Works at both \u003cstrong\u003e3.3V and 5V\u003c\/strong\u003e — an upgrade over the original 3.3V-only design, giving compatibility with a wider range of mainboards.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSPI Interface:\u003c\/strong\u003e Communicates over the stepper driver port's SPI bus (MOSI, MISO, SCK, CS), requiring no extra wiring harness.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e32-bit board compatible:\u003c\/strong\u003e Designed for 32-bit motherboards running \u003cstrong\u003eKlipper\u003c\/strong\u003e or \u003cstrong\u003eMarlin 2.0.7.2 and later\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePT100 RTD accuracy:\u003c\/strong\u003e Supports PT100 platinum resistance temperature sensors with a 430Ω sampling resistor for precise hotend temperature monitoring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-sensor support:\u003c\/strong\u003e Use up to two PT100 sensors simultaneously by inserting boards into separate driver ports (e.g., E4 and E5) and configuring CS1\/CS2 pins independently.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug-and-play installation:\u003c\/strong\u003e No assembly required — simply insert into the driver port (with port jumpered to SPI mode) and configure firmware pin definitions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoron ready:\u003c\/strong\u003e Ideal for Voron builds and other high-performance printer platforms that demand accurate high-temperature sensing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20PT100SB\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMellow\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3V \/ 5V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInterface\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSPI\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eChip Requirement\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e32-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Firmware\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eKlipper \/ Marlin 2.0.7.2+\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAssembly Required\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eFirmware Setup Overview (Marlin)\u003c\/h3\u003e\n\u003col\u003e\n  \u003cli\u003eJumper the target driver port (e.g., E5) to \u003cstrong\u003eSPI mode\u003c\/strong\u003e.\u003c\/li\u003e\n  \u003cli\u003eInsert the PT100 stick board into the driver port correctly.\u003c\/li\u003e\n  \u003cli\u003eOpen the firmware and locate the motherboard's pin definition header (\u003ccode\u003epins.h\u003c\/code\u003e).\u003c\/li\u003e\n  \u003cli\u003eIdentify the SPI pin assignments (e.g., MOSI=PB15, MISO=PB14, SCK=PB13) and the CS pin for your chosen driver port.\u003c\/li\u003e\n  \u003cli\u003eDefine the communication pins:\n    \u003cpre\u003e\n#define THERMO_SCK_PIN  PB13\n#define THERMO_DO_PIN   PB14\n#define THERMO_CS1_PIN  PB12\n#define THERMO_CS2_PIN  -1\n#define MAX31865_MOSI_PIN  PB15\n    \u003c\/pre\u003e\n  \u003c\/li\u003e\n  \u003cli\u003eSet the first nozzle thermistor type to \u003ccode\u003e-5\u003c\/code\u003e (PT100) with a sampling resistance of \u003ccode\u003e430\u003c\/code\u003e.\u003c\/li\u003e\n  \u003cli\u003eCompile and upload firmware to your mainboard.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cem\u003eFor Klipper configuration and detailed wiring diagrams, refer to the official GitHub repository for the FLY PT100 board.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/10-pack-65mm-oscillating-multi-tool-saw-blades-high-carbon-steel\"\u003e10-Pack 65mm Oscillating Multi-Tool Saw Blades | Carbon Steel\u003c\/a\u003e — great for workshop builds and enclosures.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/nitrile-work-gloves-anti-slip-full-finger-5-pair\"\u003e5-Pair Nitrile Work Gloves – Anti-Slip Full Finger Safety\u003c\/a\u003e — protect your hands during printer assembly and maintenance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/ball-end-hex-screwdriver-bit-magnetic-reduced-shank-steel\"\u003eBall End Hex Screwdriver Bit – Magnetic Reduced Shank Steel\u003c\/a\u003e — precision fastening for 3D printer frame assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is the Mellow FLY PT100 Stick Board compatible with Klipper firmware?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the Mellow FLY PT100 Stick Thermistor Board is fully compatible with Klipper firmware in addition to Marlin 2.0.7.2 and later versions. It requires a 32-bit mainboard with an accessible SPI-mode driver port (such as E4 or E5) and proper pin configuration in the firmware.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use two PT100 sensors at the same time on one mainboard?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. You can install two PT100 Stick Boards simultaneously — for example, in the E4 and E5 driver ports. Each port must be jumpered to SPI mode independently, and you configure CS1 and CS2 pins separately in your firmware to address each sensor individually.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between this board and the original PT100 stick board design?\u003c\/h4\u003e\n\u003cp\u003eA: The original design by Raymond H supports only 3.3V logic. The Mellow FLY version adds \u003cstrong\u003e5V support\u003c\/strong\u003e, making it compatible with a broader range of 32-bit 3D printer mainboards that operate at 5V logic levels on their driver ports.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board require any soldering or assembly?\u003c\/h4\u003e\n\u003cp\u003eA: No assembly or soldering is required. The PT100 Stick Board is plug-and-play — simply insert it into the correct driver port on your mainboard, set the port jumper to SPI mode, and configure the firmware pin definitions accordingly.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is the Mellow FLY PT100 Stick Board compatible with Klipper firmware?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the Mellow FLY PT100 Stick Thermistor Board is fully compatible with Klipper firmware in addition to Marlin 2.0.7.2 and later versions. It requires a 32-bit mainboard with an accessible SPI-mode driver port (such as E4 or E5) and proper pin configuration in the firmware.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use two PT100 sensors at the same time on one mainboard?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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