MQL5 & MQL4 AI Code Prompts — Generate EAs & Indicators That Actually Compile

Master Prompt #4 — Custom Indicator Template

Generate custom MT5 indicators — from simple combined indicators to complex multi-timeframe dashboards.

Act as a Senior MQL5 Developer specializing in custom MetaTrader 5 indicators. Create a custom indicator with the following specification.

INDICATOR TYPE: [Choose: Separate Window / Chart Window]

INDICATOR PROPERTIES:
- #property indicator_separate_window (or indicator_chart_window)
- Set indicator_buffers count
- Set indicator_plots count
- Define indicator_label, indicator_type1 (DRAW_LINE, DRAW_HISTOGRAM, DRAW_ARROW, DRAW_COLOR_LINE, etc.)
- Define indicator_color1, indicator_width, indicator_style

INPUT PARAMETERS:
- input int LookbackPeriod = 14; // Main calculation period
- input int SignalPeriod = 7; // Signal line period
- input ENUM_APPLIED_PRICE AppliedPrice = PRICE_CLOSE;
- input color BullColor = clrDodgerBlue;
- input color BearColor = clrTomato;

CALCULATION LOGIC:
[Describe your specific calculation here. Examples:]
- "Calculate the difference between two MAs and normalize as a percentage of the shorter MA."
- "Calculate RSI divergence — when price makes a higher high but RSI makes a lower high, plot a sell arrow."
- "Calculate the ratio of bullish candle volume to total volume over LookbackPeriod."

ONCALCULATE REQUIREMENTS:
- Properly handle rates_total, prev_calculated for efficient calculation.
- Only recalculate changed bars — do not recalculate the entire history on every tick.
- Set buffer values using array indexing: buffer[i] = value.
- Check for division by zero before any division.
- Check for ArraySetAsSeries() before using array indices.

BUFFER SETUP:
- At least 2 indicator buffers: one for main line, one for signal line.
- Optional: color buffer for multi-color lines, arrow buffer for signals.
- Set indicator_shortname to a descriptive name.

OUTPUT: Complete, compilable .mq5 indicator file. Include all #property declarations. Maintain proper OnInit/OnCalculate structure. Add comments explaining the calculation logic.

Ready-to-Use — Replace the bracketed text

Below are complete prompts for generating specific indicator types. Copy any prompt and replace [BRACKETED TEXT] with your values.

--- RSI DIVERGENCE INDICATOR ---
"Create an MT5 indicator that detects RSI divergence. Plot green up-arrows when: price makes a lower low on the last 2 swing lows, BUT RSI(14) makes a higher low — bullish divergence. Plot red down-arrows when: price makes a higher high, BUT RSI makes a lower high — bearish divergence. Use swing detection with [5] bars left and right for swing point validation. Include buffer for divergence strength — measure the difference between the RSI divergence slopes."

--- MULTI-TIMEFRAME DASHBOARD ---
"Create an MT5 dashboard indicator that displays trend direction for [EURUSD, GBPUSD, USDJPY, XAUUSD] on timeframes [M15, H1, H4, D1] in a grid. Use 50 EMA vs 200 EMA crossover for trend detection. Green cell = bullish (50 above 200). Red cell = bearish. Yellow = within 10 pips of crossover. The dashboard must auto-update on each new bar. Use OBJ_LABEL objects for clean rendering. Include a 'Strength Score' at the bottom — count of bullish timeframes minus bearish timeframes per pair."

--- ATR CHANNEL INDICATOR ---
"Create an MT5 indicator that plots ATR-based support and resistance channels. Upper band = High + (ATR([14]) × [2.0]). Lower band = Low − (ATR([14]) × [2.0]). Midline = (Upper + Lower) / 2. Plot all three as lines. Color the channel fill between upper and lower with 15% opacity. Add breakout arrows when price closes outside the channel."

--- VOLUME PROFILE INDICATOR ---
"Create a volume profile indicator for MT5. For the visible chart range, divide the price range into [20] horizontal zones. For each zone, calculate: total tick volume, percentage of total volume, and number of touches. Mark the Point of Control (POC — zone with highest volume) with a thick horizontal line. Mark Value Area High/Low (zones containing 70% of total volume). Display the volume profile as a horizontal histogram on the right side of the chart."

OUTPUT for each: Complete, compilable .mq5 with proper buffer management, OnInit/OnCalculate structure, and descriptive comments.