XAIO Base with XIAO ESP32C6 and Grove Chainable RGB LED
ChainableLED leds( /* clk / A1, / data */ D1, 1); // tried A0/D0 or A1/D1 or A2/D2 or A8/D8 or A9/D9
as you can see from this diagram the pins on each connector are different so you have to match your programming to the connector… the only one that is the same is the IIC port which can have more than one device on the bus at the same time
you are going to want to use digital D not Analog A
these LEDs are recieving data commands to change color… and so the D-Digital Mode… if you were using voltage to control the LED or PWM Pulse Width Modulation that would A -Analog Mode
It is the same pin… just in Digital or Analog Mode of Operation
kinda like how a pin can be in Input or Output Mode
for example
if you look at grove connector D5/A5 for example
it is as follows
Gnd-3v3-SDA/4 & SCL/5
so if you plug into this port use those pins
for example if you wanted to use Grove Port D0/A0
it is as follows
Gnd-3v3-SDA/1 & SCL/0
Most grove ports have pin X on the last pin (outside) and pin X+1 on the inside pin
this is also why ground is on the outside as well so if you somehow accidently put the connector backwords it will be ground to the data pin… which is much less likely to burn out a component
The grove connector in the upper left is labeled (on the base board) as 0,1,3v3,gnd. This implies that there are two data signals, “0,1” on that grove connector.
The pinout for the XIAO only shows ONE data signal, either the digital or analog output from the “A0/D0” pin. This is the root of my question - I expect each grove socket to expose two signals, but the ones on this base only expose 1. (I’m only looking at the connectors labeled for general grove interconnections, grove1 and grove2 etc, not counting the I2C and serial sockets which I am using for other I/O needs)
Since the Chainable RGB LED needs two signals (clock and data) IT CAN NOT WORK on the grove* sockets that only expose one signal…
What connector did you use for the Chainable RGB device, and what software initialization did you use to make it work?
edit: The 2813 RGB chain things only use a single signal that combines both clock and data information, and so can work with these “1-signal-only” grove connectors. I was expecting to see something like “A0/D0. + A1/D1” on each socket.
if so yes this device only has pin 0 exposed and pin 1 is NC for Not Connected to anything…
I dont know exactly why they did this… it does cause a problem if you are trying to use UART and this pin as 2 data…
OH yeah… they did this so the pin 1 could be used for the user button on this device
I’m using the other Grove XIAO base, the one without an OLED but with a battery manager.
I built a bodge cable to merge the signals from two sockets into one 4-pin cable (and verified it with a meter and an encoder), but have been unable to make the Chainable RGB code work with the non-neopixel grove RGB LEDs or the grove RGB LED strip driver…
This one has 2 io’s per grove connector plus PWR & GND, So your good. Battery management is separate and there’s a power on/off switch to , check the wiki
Not really - they only expose one,a single pin in either analog or digital form…
A0/D0 is the same pin on the grove connector, there isn’t anything on the 2nd pin. Same for A1/D1
The markings on the silkscreen don’t match this picture - A5/D5 isn’t I2c, A7/D7 isn’t TX/RX…
The pictorial documentation of the XIAO Base is at best confusing. Making it match the rest of the grove 4-pins-per-connector documentation, it should call out the connectors as:
Gnd
5v
A1/D1
A0/D0
instead of the ambiguous and misleading
D0
A0
I can’t upload a *fixed" picture, so you will have to imagine…
Hi there,
I go by the silk screen… TWO io.per connector. ie. A4 & A5 for I2C for example.
They do Overlap. So good Luck BTW you can also add some flash to it as I have check the demo’s
HTH
GL PJ
Se the Demo , may help you figure it out…and there is one on the wiki using the round LED ring.
I would have, except for the table towards the end of (Grove Base Docs) that says
Supported Boards … “Pin Difference: slightly different”
for everything except the SAMD chip…
Combine this with the base board pinout diagram that (because it chose a confusing graphical layout for the grove connectors) does not match the silkscreen, and you get a thread like this…
I can agree that the D0/A0 is confusing… the reason is because sometime a pin may be digital but not analog capable if the internal of the chip does not have an ADC
PJ
