Single Phase Smart Power Meter (PEM-1000)
WiFi
LoRa
Features
PEM-1000 can measrue AC (1) Voltage: 80 ~ 260V AC, (2) Current: 0 ~ 100A, (3) Power: 0 ~ 22KW, (4) Electrical Energy: 0 ~ 9999KWh.
PEM-1000 can transmit the measured data values using (1) MQTT/WiFi, (2) WiFi and (3) LoRa techniques. Method (1) sends MQTT messages to the remote MQTT broker directly. Methods (2) requires MQTT server and method (3) requires LoRa MQTT Gateway to relay the received messages to the MQTT Server. Messages processed in the MQTT Server can be displayed in the remote PC monitor via a private VPN link.
Hardware Features
PEM (Power Energy Module)
WiFi Specification
LoRa Specification
Power Supply
Measure Voltage, Current, Power and Energy
IEEE 802.11b/g/n
433MHz, BW 125KHz, SF 10
DC 12V
Software Features
Message Protocol
Push Notification
MQTT, JSON, IFTTT, Webhook (Supported by Gateway/Server)
LINE Notify (Supported by Gateway/Server)
Current Coil
Transformer
LoRa Antenna
Current coil is used to measure current from 0 ~ 100 Amps. Current coil transformer ratio is 1000:1.
Transform provides 380V to 110V or 220V conversion which is used to measure 380V AC. Voltage scaling is needed.
433 MHz LoRa Antenna, antenna gain is 5/7 dB.
PEM-1000 with MQTT
Method (1) MQTT/WiFi is the simplest way to send messages to the MQTT broker in the Internet and be relayed by the MQTT broker and received by the APP in the smart phone.
PEM-1000 can measrue AC (1) Voltage: 80 ~ 260V AC, (2) Current: 0 ~ 100A, (3) Power: 0 ~ 22KW, (4) Electrical Energy: 0 ~ 9999KWh, (5) Frequency.
PEM-1000 send (publish) 5 Topics to the public EMQX broker via the Internet. The EMQX public broker re-sends the MQTT messages to the Smart phone, i.e., the Smart phone subscribes the exact 5 Topics to the EMQX broker.
The Smart phone receives the MQTT messages and uses the APP (MQTT Panel) to diplay the measured results of the MQTT messages. The local MQTT server (MQSRV) can also receives the MQTT messages and processes the received values (Voltage, Current, Power, Energy and Frequency) and displays the values on the PC screen as shown in the Figure.
PEM-1000 with LoRa
PEM-1000 LoRa signal consists of sensor device name (PEM), ID number (R1 ~ Ri), Sequence number, each measured item name (Voltage, current, power, frequency, energy) and the associated data consecutively in JSON format. LoRa signals from each PEM-1000 are transmitted to the LoRa Gateway (LRMQ-1000).
LRMQ-1000 encapsulates the received LoRa signal into MQTT format with a predefined Topic and then retransmit the MQTT signal to the MQTT server (MQSVR) using 2.4 GHz WiFi for further processing.
MQTT Server parses each received MQTT messages into voltage, current, power, frequency and energy values for each individual PEM-1000 device. The processed values can be displayed in the remote PC monitor as shown in the figures.
