spark_abacus
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spark_abacus [2017/01/18 20:20] – add PZEM-004T kingkevin | spark_abacus [2017/01/23 14:01] – [DDM100TC] kingkevin | ||
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The device also offers a serial port (isolated from mains electricity using optocouplers) so to be able to read out the measured values. | The device also offers a serial port (isolated from mains electricity using optocouplers) so to be able to read out the measured values. | ||
- | The serial | + | The serial |
Compared to the [[spark_counter# | Compared to the [[spark_counter# | ||
Else it uses the same design and chip. | Else it uses the same design and chip. | ||
+ | |||
+ | ===== DDM100TC ===== | ||
+ | |||
+ | The [[http:// | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | The meter provides: | ||
+ | * 1 LCD to show the energy used in kWh (with a precision od 0.1 kWh) | ||
+ | * 3 LEDs to show which phase powered (L1, L2, L3) | ||
+ | * 1 LED to show the direction to the current (reverse if REV is on) | ||
+ | * 1 LED to show impulses as energy is used | ||
+ | * 1 S0 interface to output impulses as energy is used | ||
+ | |||
+ | The S0 interface (labelled TEST on the side) allows me to collect the energy used on my micro-controller. | ||
+ | Connect the + side (pin 8) to a positive voltage (i.e. +5V), an the - side (pin 7) to an input (with a pull-down resistor). | ||
+ | Each impulse will generate a high signal (+2.5V in my case) on - for ~ 90 ms. | ||
+ | The number of impulses indicates the energy used, and the time interval between impulses indicates the current power consumption. | ||
+ | I chose one with a high impulse rate of 1600 impulses/ | ||
+ | |||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | {{: | ||
+ | |||
+ | There is also the DDM100TCR model with an RS-485 interface, but I couldn' | ||
====== EPS8266 ====== | ====== EPS8266 ====== | ||
- | To send the values I used a WiFi module based on the [[http:// | + | To send the values |
Several [[http:// | Several [[http:// | ||
- | Since I only use it' | + | Since I only use its WiFi functionality, |
===== ESP-01 ===== | ===== ESP-01 ===== | ||
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{{ : | {{ : | ||
- | To use the device, simply connect | + | To use the device, simply connect GND, VCC (3.3V), RX (module input), TX (module output), RST (using a pull-up resistor), and CH_PD (using a pull-up resistor). |
===== AT firmware ===== | ===== AT firmware ===== | ||
My module showed the following firmware information when powered up (with 9600 8N1 serial configuration): | My module showed the following firmware information when powered up (with 9600 8N1 serial configuration): | ||
- | When using the '' | + | When using the '' |
- | This custom firmware wasn't particularly stable, so I decided to use a more recent standard one. | + | This custom firmware wasn't particularly stable, so I decided to use a more recent, and standard one. |
To flash a firmware you have to enter the bootloader mode by connecting GPIO0 to ground. | To flash a firmware you have to enter the bootloader mode by connecting GPIO0 to ground. | ||
Line 47: | Line 74: | ||
I used [[https:// | I used [[https:// | ||
- | Espressif | + | Espressif |
Since I only want to use this module for its WiFi connectivity I only care about the AT firmware. | Since I only want to use this module for its WiFi connectivity I only care about the AT firmware. | ||
- | The AT firmware allows to use the ESP over serial | + | The AT firmware allows to control |
- | This firmware is provided in the NONOS SDKs (V2.0.0 | + | This firmware is provided in the NONOS SDKs (V2.0.0 |
The module I had uses a 25Q40 flash chip with only 4Mbits/ | The module I had uses a 25Q40 flash chip with only 4Mbits/ | ||
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* [[http:// | * [[http:// | ||
* various [[http:// | * various [[http:// | ||
- | Since I'll only use it as server I decided to go with debian jessie | + | Since I'll only use it as server I decided to go with an [[https:// |
The pin header is the same as the [[http:// | The pin header is the same as the [[http:// | ||
I am only using this SBC a cheap computer rather than hardware platform. | I am only using this SBC a cheap computer rather than hardware platform. | ||
Also, don't forget to put a heat sink on the CPU, else they will be slowed down quite often because of the high temperatures. | Also, don't forget to put a heat sink on the CPU, else they will be slowed down quite often because of the high temperatures. |
spark_abacus.txt · Last modified: 2024/01/07 17:49 by 127.0.0.1