Hi to all. Can anyone provide me with a simple routine to start controlling a DS1804 to slowly turn an LED on and off? I get the error: "[DS1804] Wiper is at position 0. Additional clock pulses are ignored" I use the tom-dudman library. Thank you. Thank you.

Please post your sketch, using code tags when you do

My code is very ugly, sorry ... #include <DS1804.h> const byte wiperPin = A5; // DS1804( byte CSpin, byte INCpin, byte UDpin, unsigned long maxResistance ); DS1804 digipot = DS1804( 7, 5, 6, DS1804_FIFTY); //DS1804 digipot = DS1804( 6, 5, 4, DS1804_TEN ); byte reading = 0; unsigned long new_res…

[image] Breixo: I get the error: "[DS1804] Wiper is at position 0. Additional clock pulses are ignored" So it thinks you're trying to turn it down further when it's already at minimum. How does your code ensure that you don't try to keep turning down below minimum, or up above maximum?

No, the idea is not to use the DS1840 to control an LED. I am using a simulator that can do it, it is just a scheme to know if it works or not. A simple UP and DOWN control sketch. It would be enough for me to get out of the quagmire.

[image] Breixo: ...routine to start controlling a DS1804 to slowly turn an LED on and off? : : : No, the idea is not to use the DS1840 to control an LED… Some clarification is needed..! 1840 & 1804. more haste, less speed. Maybe start again?

Sorry, is a DS1804 a Maxim Dig Pot.

[image] Breixo: a simple routine Did you look at any of the examples that came with the library? There is no need for you to be manipulating the pins the digital potentiometer is connected to, that's the hole point of using a library. You didn't use any of the functions that take care of th…

[image] Breixo: Maxim are no more - now Analog Devices: DS1804 Datasheet and Product Info | Analog Devices The DS1804 NV trimmer potentiometer is a nonvolatile digital potentiometer that has 100 positions. The device provides an ideal method for low-cost trimming applications us…

Sorry, I'm a very bad programmer. Although at the end of the design I will have to use the serial, what I really want is to see the DS1804 increase/decrement. I had already tried this sketch, I tried it again but I can't see it working in the simulator. At the risk of sounding like an abuser, could…

Controling a DS1804 Digital Potentiometer

Projects Programming

awneil September 27, 2023, 9:10am 4

What do you mean by that? You're not thinking of using it as a variable series resistor for the LED, are you?

Digital pots are not (generally) designed for power control - the DS1804 has a maximum current of only 1mA.

The usual approach is to use PWM...

Topic		Replies	Views
Replacing a 10k potentiometer with a programmable timer General Guidance	53	455	November 25, 2025
MCP42010 digital POT Programming	24	548	January 1, 2025
74hc595 chip. Fade leds met een potmeter Nederlands	66	311	November 10, 2025
Potentiometer to adjust 4 LED's up and down in wave-like pattern Programming	26	356	December 27, 2024
Building Temperature Meter using UNOR3 and LM35 sensor Sensors	55	457	January 9, 2026

Controling a DS1804 Digital Potentiometer

Related topics