Yes
Yoghurt machines can make natto, but because the temperature is not easy to control, in summer and winter, it is difficult to maintain the temperature required for natto fermentation (37- 42 degrees), especially in summer.
I bought a temperature controller, set the temperature of the thermostat at 39 degrees, and then plugged the yogurt machine socket into the thermostat, so that when the temperature reaches 39 degrees, the thermostat will When the power is off, that is, the yogurt machine does not heat. When the temperature drops to 38 degrees, the thermostat is powered on again, and the yogurt machine heats up.
By analogy, all small appliances with heating functions can be used to make natto. For example, many electric cookers used by people in Suzhou and Wuxi are made of foam inside and plastic outside. To improve the heat preservation effect, if the electric cooker is connected to the thermostat, turn on the low temperature switch, so that the temperature in the electric cooker can be maintained at about 40 degrees; the rice cooker can also make natto, and the rice cooker can be used with the thermostat. Connect the controller, put a small amount of water in the rice cooker, and then put the natto container into it. Place the temperature probe on the beans. When the temperature reaches the set value of 39 degrees, the rice cooker will automatically power off. When the temperature drops, the rice cooker will turn off the power. The rice cooker heats automatically.
In order to maintain the humidity in the natto, please tie 6 layers of gauze or a clean towel around the mouth of the container.
In short, the key issue in making natto is the strain. Good strains can make good natto, but it also requires suitable conditions. Temperature is the first, followed by humidity, and then the amount of air. That is the thickness of the beans, and finally the quality of the beans. Choose fresh soybeans to make natto.