diff --git a/relay/attachments/5v-relay-normally-closed-layout.png b/relay/attachments/5v-relay-normally-closed-layout.png new file mode 100644 index 0000000..f652e4b Binary files /dev/null and b/relay/attachments/5v-relay-normally-closed-layout.png differ diff --git a/relay/attachments/5v-relay-normally-open-layout.png b/relay/attachments/5v-relay-normally-open-layout.png new file mode 100644 index 0000000..2145478 Binary files /dev/null and b/relay/attachments/5v-relay-normally-open-layout.png differ diff --git a/relay/attachments/5v-relay-pins-layout.png b/relay/attachments/5v-relay-pins-layout.png new file mode 100644 index 0000000..10921cd Binary files /dev/null and b/relay/attachments/5v-relay-pins-layout.png differ diff --git a/relay/attachments/main-proj-architecture.dot b/relay/attachments/main-proj-architecture.dot new file mode 100644 index 0000000..438574d --- /dev/null +++ b/relay/attachments/main-proj-architecture.dot @@ -0,0 +1,20 @@ +digraph overview { + node [fontname = Arial]; + l1 -> server; + l2 -> server; + server -> r1; + server -> r2; + r1 -> server; + r2 -> server; + l1 [label = "Light Meter 1", color = lightblue, style = filled]; + l2 [label = "Light Meter 2", color = orange, style = filled]; + r1 [label = "Relay 1", color = lightblue, style = filled]; + r2 [label = "Relay 2", color = orange, style = filled ]; + server [label = "Midpoint (Server)"]; + subgraph cluster0 { + style = filled; + color = lightgrey; + r1; + r2; + } +} diff --git a/relay/attachments/main-proj-architecture.png b/relay/attachments/main-proj-architecture.png new file mode 100644 index 0000000..7b125dd Binary files /dev/null and b/relay/attachments/main-proj-architecture.png differ diff --git a/relay/attachments/pinout-terminal.png b/relay/attachments/pinout-terminal.png new file mode 100644 index 0000000..c7f9533 Binary files /dev/null and b/relay/attachments/pinout-terminal.png differ diff --git a/relay/attachments/wiring-diagram-relay.png b/relay/attachments/wiring-diagram-relay.png new file mode 100644 index 0000000..15aab48 Binary files /dev/null and b/relay/attachments/wiring-diagram-relay.png differ diff --git a/relay/rtr-relay.md b/relay/rtr-relay.md index e69de29..523a2fb 100644 --- a/relay/rtr-relay.md +++ b/relay/rtr-relay.md @@ -0,0 +1,135 @@ +# Return to Ritherdon: Relay + +Relay is one of three smaller projects which make-up the 'Personal +Flash in Real-Time' -- which is one artwork with the main 'Return to +Ritherdon' project.You should view the three smaller projects as one +project. And, for the purpose of this documentation, I will refer to +'Personal Flash in Real-Time' as a system instead of an artwork. + +For more information on the 'Return to Ritherdon' project, use the +following link: + +- [Return to Ritherdon Overview](https://git.abbether.net/return-to-ritherdon/rtr-docs) + +### 'Personal Flash in Real-Time': Project Overview + +The overall system ('Personal Flash in Real-Time') consists of three +separate/smaller projects. You should not view them as individual +pieces within the overall project. From an artwork point-of-view, +'Personal Flash in Real-Time' is one piece. The name of the software +projects are 'Light Meter' (which is this one), 'Midpoint' and +'Relay'. All three projects reside in their own git repositories. You +can find the repositories at the following links: + +- [Light Meter](https://git.abbether.net/return-to-ritherdon/light-meter) +- [Mid-Point](https://git.abbether.net/return-to-ritherdon/midpoint) +- [Relay](https://git.abbether.net/return-to-ritherdon/relay) + +The (technical) aim of the project is to turn a set of lights on at +the gallery when the welding machines are active in the welding booths +at Ritherdon. The solution we arrived at was a three-stage +process. The stages are as follows: + +1. Monitor the light levels in the welding booths at Ritherdon and + send that information to a sever (Light Meter). +2. Receive the light readings and store them in a database and make + them available for others to access (Midpoint). +3. Have the lights installed at the gallery connected to wi-fi enabled + relays which request the latest light readings from the server. If + the readings are above a certain threshold, have the light in the + gallery turn on (otherwise, turn off). The relays are responsible + for turning the lights on and off (Relay). + +Each step should require no human intervention. + +For more information on how each project accomplishes its task, please +use the (repo.) links above. Otherwise, here is an diagram to help +explain the three stages mentioned above. + +![Main Project Architecture](attachments/main-proj-architecture.png) + +## Hardware Specifications + +Here are a list of parts used in this project: + +- [Raspbian](https://www.raspberrypi.org/downloads/raspbian/) (You can + use the G.U.I. or "headless" version) +- [Raspberry Pi + 4](https://www.raspberrypi.org/products/raspberry-pi-4-model-b/) (I + am assuming you have the appropriate power cable, S.D. cards Etc.) +- [Single Channel 5v Relay](https://www.amazon.co.uk/Dealikee-Module-Indicator-Channel-Arduino/dp/B08ZJ9T355/ref=sr_1_12?dchild=1&keywords=5v+relay+module&linkCode=gs3&qid=1635877670&qsid=262-0370227-8667213&sr=8-12&sres=B08YK9V3V6%2CB07RKH9KLM%2CB06XK6HCQC%2CB01H2D2RI0%2CB08MTD5BPJ%2CB07PZC9ZMM%2CB07CNR7K9B%2CB08ZJ9T355%2CB07V1YQQGL%2CB07MY2R2ML%2CB07G71S7VP%2CB09C2ZHXXP%2CB08GPF9FNX%2CB09CN81J32%2CB07SDLJSWB%2CB08YJ6TS29%2CB08V15SNZS%2CB09DS3DD1J%2CB08KWPMP2V%2CB07TTVYGC8&srpt=RELAY) + +### Checking Your Raspberry Pi's Hardware Layout + +Because there are multiple versions of the Raspberry Pi, the layout of +the General Purpose Input/Output (G.P.I.O.) Pins differ. A quick way +to find out how the G.P.I.O. pins are laid out, for the Pi you are +currently working on, is to open a terminal and entering the following +command `pinout`. + +Doing this will lead to you seeing something similar to the image +below, + +![pinout-terminal](attachments/pinout-terminal.png) + +More information about this can be found at the following URL: + +- [Checking Raspberry Pi Board Version](https://www.raspberrypi-spy.co.uk/2012/09/checking-your-raspberry-pi-board-version/][Raspberry Pi Board Information) + +## Wiring-Up the Relay + +- [Wiring Single Channel Relay with Raspberry Pi](https://www.14core.com/wiring-single-channel-relay-with-raspberry-pi-on-wiringpi-python/] + +I used this article/blog post (linked above) as a starting-point for +the relay part of the project. It includes software written in C and +Python but I have stuck to just Python for this project. You can see +how the relay is wired-up to the Pi in the image below. + +#+Caption: Wiring Diagram for the Relay Project +#+Name: wiring-diagram-relay +![Wiring Diagram Relay](attachments/wiring-diagram-relay.png) + +### General Overview of Controlling Relays + +- [Four Ways to Control Electronic Relays](https://makezine.com/2018/03/19/control-electronic-relays/) + +This is a primer for understanding how to control relays and the +various types of relays at your disposal. The list is not exhaustive +but is enough to get you going. + +- [YouTube Guide](https://www.youtube.com/watch?v=58XWVDnB7Ss) + +I find the guy in this video difficult to understand but he gets his +message across well enough. He explains how a relay works and how to +connect it to an *Arduino Board* and control a light bulb. If you are +not familiar with how relays work, this video should give you a good +grounding in it. /Note: This video does not use a Raspberry Pi so the +information is limited to just the relay and the light part of the +project. + +- [How to Set-up a 5v Relay](https://www.circuitbasics.com/setting-up-a-5v-relay-on-the-arduino/) + +The link above focuses on using an *Arduino Board* but you can +determine what pin does what. The example in the link, also, +includes a thermistor in its set-up which does not apply to this +project. The image below is taken from the site and +highlights what each pin is. + +![Relay Pins Layout](attachments/5v-relay-pins-layout.png) + +- **NO (Normally Open)**: In the normally open configuration, when the + relay receives a HIGH signal the 120-240V switch closes and allows + current to flow from the C terminal to the NO terminal. A LOW signal + deactivates the relay and stops the current. So if you want the HIGH + signal to turn ON the relay, use the normally open terminal. See + /figure [[no-configuration]]/ for further information. +- **NC (Normally Closed)**: In the normally closed configuration, a HIGH + signal opens the switch and interrupts the 120-240V current. A LOW + signal closes the switch and allows current to flow from the C + terminal to the NC terminal. Therefore, if you want the HIGH signal + to turn OFF the 120-240V current, use the normally closed + terminal. See /figure [[nc-configuration]]/ for further information. + +![Relay Normally Open Layout](attachments/5v-relay-normally-open-layout.png) + +![Relay Normally Closed Layout](attachments/5v-relay-normally-closed-layout.png)