New module: POT board
#7
Well the normal 0.1" connector used by the larger buses (pi and euler in the case of pine64) are ok when you have a number of pins, but when you get down to 4 and 5 pin connections, have an annoying tendency to come apart. So they used a locking connector that makes it harder for the connection to come apart by accident. For sensors that may be in remote things that is probably a reasonable decision. From the photo, it looks like it may be one of the standard (JST?) connectors. If you are not worried about the cables coming out when you yank on them, I assume that a normal 4 pin 0.1" female header will fit inside of the locking connector.

However, there is a disconnect in their i2c designs. The normal i2c connection has 4 pins (ground, power, scl, sda) and most of the plugs have 4 pins. But the ambient light sensor wants to pass a 5th pin (called nInt, which presumably is a pin that goes high when the state changes so that you can attach an interrupt so that you know when their is new data). They put the nInt pin between ground and sda pins, which means you can't intermix 4 pin and 5 pin i2c connections.

As to what i2c is, it is a slow speed shared bus that you can attach simple devices to it (up to about a 100 or typically less). Each slave device has an address (much like a telephone) and the master builds a packet that has the address in it, and the slave devices will only respond if the address matches their configured address. On a given i2c bus, each address must be unique. Depending on the device, there might be switches or solder jumpers to change the address, or some devices have an i2c command to change their address.

Note, without using extenders, etc. the i2c bus is fairly limited, and the total length of all wires should be under a few meters.

The board is mis-named (IMHO). From the title, it sounds like a board that can directly hook up 12 potentiometers (variable resisters like analog dials), but instead it is a shared i2c bus board. Yes, you can hook up 12 i2c devices, each of which provides a potentiometer and has a small microprocessor to do the i2c connection, but you can also hook up displays, switches, etc.

I don't know if the Linux and Android OSes can enable higher speed i2c buses. The last time I checked, the Raspberry Pi could only do the slowest i2c speed (100kHz).
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Messages In This Thread
New module: POT board - by Crispin - 01-30-2016, 07:30 PM
RE: New module: POT board - by Ghost - 01-30-2016, 08:11 PM
RE: New module: POT board - by stephen fleming - 01-30-2016, 08:19 PM
RE: New module: POT board - by CanadianIceTech - 01-30-2016, 11:00 PM
RE: New module: POT board - by stephen fleming - 01-31-2016, 11:42 AM
RE: New module: POT board - by CanadianIceTech - 01-31-2016, 03:59 PM
RE: New module: POT board - by khgoh - 01-31-2016, 05:43 PM
RE: New module: POT board - by CanadianIceTech - 01-31-2016, 06:18 PM
RE: New module: POT board - by Crispin - 01-30-2016, 11:43 PM
RE: New module: POT board - by duane - 01-31-2016, 12:20 AM
RE: New module: POT board - by MichaelMeissner - 01-31-2016, 08:24 AM
RE: New module: POT board - by Crispin - 01-31-2016, 08:18 PM
RE: New module: POT board - by MichaelMeissner - 01-31-2016, 07:00 PM
RE: New module: POT board - by khgoh - 01-31-2016, 07:27 PM
RE: New module: POT board - by MichaelMeissner - 01-31-2016, 08:46 PM
RE: New module: POT board - by Liuka Finke - 02-19-2016, 10:13 AM
RE: New module: POT board - by MichaelMeissner - 02-19-2016, 11:54 AM
RE: New module: POT board - by khgoh - 02-20-2016, 03:59 AM
RE: New module: POT board - by COMPUTIAC - 02-22-2016, 10:53 PM
RE: New module: POT board - by khgoh - 02-22-2016, 11:33 PM
RE: New module: POT board - by Artyom - 07-05-2016, 01:19 PM
RE: New module: POT board - by khgoh - 07-07-2016, 09:13 PM
RE: New module: POT board - by Artyom - 07-08-2016, 09:45 AM
RE: New module: POT board - by khgoh - 07-11-2016, 04:01 AM
RE: New module: POT board - by Artyom - 07-12-2016, 11:02 AM
RE: New module: POT board - by khgoh - 07-12-2016, 08:47 PM

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