Greenhouse i2c control board
This board was built originally for control from a Win98 box using i2cee and Visual Basic.
Now to be controlled by the router.
Most of my old notes are hard to understand hence this more determined attempt to document efforts.
Objective
Control and monitor greenhouse and hydroponic systems using Blassic basic on the router
So what's on the i2c bus?
midge# i2cdetect -l
i2c-0 i2c ADM5120 I2C Bit-shift algorithm
midge# i2cdetect -a 0
WARNING! This program can confuse your I2C bus, cause data loss and worse!
I will probe file /dev/i2c/0.
I will probe address range 0x00-0x7f.
Continue? [Y/n]
.....0 .1 .2 .3 .4 .5 .6 .7 .8 .9 .a .b .c .d .e .f
00: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
10: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
20: 20 21 22 XX XX XX XX 27 XX XX XX XX XX XX XX XX
30: XX XX XX XX XX XX XX XX XX 39 3a 3b 3c 3d XX XX
40: XX XX XX XX XX XX XX XX 48 XX XX XX 4c 4d XX XX
50: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
60: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
70: XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX XX
midge#
All i2c chip addresses that might be on the bus at some time - red items not on greenhouse board
| Chip | HEX | DEC | Task | ||||||||
| PCF8574P | 20 | 32 | Read Maplin thermometers - port A (top middle) - Greenhouse board | ||||||||
| PCF8574P | 21 | 33 | Read Maplin thermometers - port A (top left) - Greenhouse board | ||||||||
| PCF8574P | 21 | 34 | Read column C - door states etc - Greenhouse board | ||||||||
| PCF8574P | field probe SMD Eurocard chicken detector | ||||||||||
| PCF8574P | 27 | 39 | small test board | ||||||||
| PCF8574AP | 38 | 56 | Screen Relays driver on 52 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 |
| PCF8574AP | 39 | 57 | A/D multitiplex driver - Greenhouse board | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 |
| PCF8574AP | 3A | 58 | Maplin thermometer multiplex - Greenhouse board | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 |
| PCF8574AP | 3B | 59 | Water control - 8 yellow LEDs - Greenhouse board | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 1 |
| PCF8574AP | 3C | 60 | Water control - 8 red LEDs - Greenhouse board | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 |
| PCF8574AP | 3D | 61 | Water control - 8 green LEDs - Greenhouse board | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 1 |
| PCF 8591P | 4C | 76 | 8bit A to D on small test board | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 |
| PCF8591 | 4D | 77 | 8 bit A to D on Greenhouse board | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 |
| LM75 | 48 | 72 | Thermometer on small test board | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 |
| LM75 | 49 | 73 | Thermometer on long free cable | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 1 |
| LM75 | 4A | 74 | Thermometer - not yet wired | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 0 |
| LM75 | 4B | 75 | Thermometer on short free cable | 0 | 1 | 0 | 0 | 0 | 0 | 1 | 1 |
| Solar Water heater monitor - not on greenhouse line |
|||||||||||
| LM75 | 48 | 72 | T1 roof - tube manifold | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 0 |
| LM75 | 4A | 75 | T4 feeder tank bottom | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 0 |
| LM75 | 4B | 76 | T2 prime tank bottom | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 |
| LM75 | 4C | 77 | T5 feeder tank top | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 0 |
| LM75 | 4D | 78 | T3 prime tank top | 0 | 1 | 0 | 0 | 1 | 1 | 0 | 1 |
| PCF 8591P | 49 | 73 | Sunlight monitor | 0 | 1 | 0 | 0 | 1 | 0 | 0 | 1 |
| PCF8574P | 20 | 32 | pump & heater monitor / tank switch over | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| ADSL7823 | 12bit A to D on field probe SMD Eurocard | ||||||||||
| LM75 | Thermometer on field probe SMD Eurocard | ||||||||||
| A2 | A1 | A0 |
NB! LM75 and PCF8591 share the address space starting with hex 4
both have 3 address lines
The PCF8574 tests have this format (address and bytes out are decimal)
Send 123 to the 8 yellow LEDS
midge# PCF8574_addr_byteout 59 123
A/D multiplex test
Read volts on grey wire of terminal strip - line 7 of the 8 multiplex inputs (0-7) connected to the first A/D input 0
Send 7 to the multiplex switch - 3 wires from
PCF8574P address decimal 57 all to go high (3 LEDs on)
read the volts on the
PCF8591 address decimal 77 first line (0) - pink wire
see this -
midge04# PCF8574_addr_byteout 57 3
midge04# PCF8591_addr_line_V 77 0 200 (the output V, 200, can be any from 0 to 255 as it is not used)
BYTE = 60 (volts on test pot)
midge04
The second multiplex port feeds the second line (1) - grey wire - of the PCF8591 A/D
again use -
PCF8574_addr_byteout 57 3 to read line 7 as before -
but read as -
PCF8591_addr_line_V 77 1 200
Please email me if you work on a similar system.