I am trying to make a fan control that has low, medium, and high speed settings.
The fan is a DC motor that will run at 1.5 (low), 3(med), and 4.5V(high). I will have a momentary pushbutton for on/off and for sake of design I would like to use a momentary pushbutton to change speed settings as such:
Turn unit on
unit will start in low
pushing the speed control momentary will increment in the pattern L-M-H-L-M-H...
I thought that using a digital pot may be the solution, but they usually have more than 3 settings and I do not want to have to implement a counter circuit to reset to zero after every transition from high to low speed. It seems that most button-controlled digipots also have very small current capabilities which seem like they would be susceptible to issues with back EMF.
Any suggestions?
The fan is a DC motor that will run at 1.5 (low), 3(med), and 4.5V(high). I will have a momentary pushbutton for on/off and for sake of design I would like to use a momentary pushbutton to change speed settings as such:
Turn unit on
unit will start in low
pushing the speed control momentary will increment in the pattern L-M-H-L-M-H...
I thought that using a digital pot may be the solution, but they usually have more than 3 settings and I do not want to have to implement a counter circuit to reset to zero after every transition from high to low speed. It seems that most button-controlled digipots also have very small current capabilities which seem like they would be susceptible to issues with back EMF.
Any suggestions?
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