A signal generator module which is capable of generating a single PWM output with a programmable frequency between 1Hz to 150KHz and a duty cycle between 1 to 100 %. Both frequency and duty cycle can be programmed via 4 push buttons which increment or decrement the frequency in 1Hz, 10Hz, 100Hz, or 1KHz steps (depending of frequency) and duty cycle in 1% increments (see specification below). Current frequency and duty cycle can be viewed on a clear 1.5" display consisting of white text against a blue backlight.
Specification:
Product Code: HCMODU0134
Supply Voltage: 3.3 to 16V
Supply Current: ~30mA (no load)
PWM Amplitude: PWM amplitude = Supply voltage
PWM Freq (min): 1Hz
PWM Freq (max): 150KHz
PWM Freq Resolution: 1Hz (<100Hz), 10Hz (<1KHz), 100Hz (<10KHz), 1KHz (<150KHz)
PWM Duty resolution: 1% (>2% at 100KHz and above)
PWM Output current: 30mA at 16V Vin (output is supplied via 100R pullup resistor from Vin)
Frequency display:
1 = 1Hz
100 = 100Hz
1.00 = 1KHz
10.0 = 10KHz
1.0.0 = 100KHz
FAQ:
I noticed there are two PWM outputs, does this mean the module can generate two independent PWM signals?
No, the two PWM output terminals are shorted together and therefore are the same signal.
On the underside I see a serial interface, what is this for?
This serial interface allows for the frequency and duty cycle to be remotely programmed via a serial interface. However in out test we have had mixed success in getting this interface to work reliably. Therefore we do not advertise or guarantee this feature. If you wish experiment with this interface the serial interface settings are 9600 Baud, 1 stop bit, and no parity. To change the frequency send the following command:
F101: set frequency to 101HZ (001 to 999)
F1.05: set frequency to 1.05KHZ (1.00 to 9.99)
F10.5: set frequency to 10.5KHZ (10.0 to 99.9)
F1.0.5: set frequency to 105KHZ (1.0.0 to 1.5.0)
To set the duty cycle:
DXXX: set PWM duty cycle to XXX: (001 to 100)
Such as D050, set PWM duty cycle is 50%
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