USB library and printf function and the control code takes only about 10%. Microcontroller has 8kB of program space and code uses 92% of it.
This microcontroller, like many other cheap microcontrollers, doesn't have native floating point unit, so all arithmetic is done without floating point numbers to save program space. Isn't very useful and the controller works really as a PI controller. PID controller is used to adjust the relay PWM signal, but because the oven responds very slowly the derivate component of the PID Microcontroller starts the reflow automatically with profile loaded from EEPROM.
CHEAP REFLOW OVEN SERIAL
On the computer side the microcontroller looks like a serial port and commandsĬan be sent and read with any serial port program. Through USB port to computer for logging if it's connected. Every second current and target temperatures are outputted State machine is used to get the current reflow stateĪnd target temperature. Program reads the current temperature of the oven from MAX31855 chip through SPI,Īt the same time the chip also gives room temperature and signals if there is anyįaults with the thermocouple. The solid state relay which can be used to accurately control the temperature of the oven.īoard with USB cord and wire to fix the unrouted trace. Microcontroller will read the temperature and output PWM signal for Temperature is measured using thermocouple inside If the computer isn't connected, it should be able to be switched on by just connecting the power supply, load the temperature profile from non-volatile memory and run without user intervention.īecause the oven gets very hot, it's not possible to add any electronics inside it.Ĭontrolling is done by switching the power on and off rapidly with solid state relay This would be cheaper to make and easy to use. Instead of buttons and dedicated display, it should use USB portįor setting the temperature profile and monitoring the temperature if needed. I wanted to make a simple and cheap controller that wouldn't use outdated parts. Toaster oven reflow controllers have been done before many times (for example 1 and 2). External controller board can be used to control these ovens. They are much cheaper than real reflow ovens, but temperature cannot be set programmatically Real reflow ovens are usually expensive, like many other manufacturing tools,īut ordinary toaster ovens can be used in reflow soldering with few modifications. If the temperature rises too slowly, too much flux can evaporate and the Too quickly it can damage the components and 621 products found for cheap reflow oven 1/6 Reflow Oven ETA High End SMT Reflow Oven Manufacturer Lyra 622 Soldering Machine 21,000.00-28,000.00/ Set 1.0 Sets (Min. The make of the machines is compact, allowing for portability. Also, these products enable edge-to-edge joining with overall consistent temperatures and negligible fall in temperature. They are easy to operate, with no training. Source: Wikipediaįor the solder paste to work correctly temperature of the oven mustįollow correct temperature profile accurately. cheap reflow oven exhibit high-performance regardless of component size or density.
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